Because VV haven't made anything good since SF, which is one of their only great works (the only great one I've played...). Take a moment and really look at their pedigree...

Pre-2010 -
I've barely played any of these titles, mainly just the Crash GBA games they made- which were just alright, fairly clunky and a bit ugly but not that bad to play, from what I remember. Nothing I want to come back to. Lacking the charm or creativity of the oldest Crash games and there isn't anything much I remember from them. Except for some reason I remember the shark chase levels really well, those were definitely a fun aesthetic that I didn't remember seeing before.
CNK GBA is pretty awful with how ugly it is, its blatantly terrible draw distance (which doesn't sound like a big deal, except in a racing game that kinda sucks if you don't divert your eyes to the map or know where to turn and whatnot already...) and how poorly it controls, and I can actually vouch for that when I played it again a few months ago.
Almost everything else they made during this time looks to be either licensed shovelware, a port (sometimes of licensed shovelware), or a not-so-good entry in some legit series (see: later GH games). Or that weird GBA port of Jet Set Radio.

SA 3DS - actually pretty good, I'd say borderline great however it's just a little too barebones to achieve that. But for the time limit they had to make it, that's fairly forgiveable as well.

Cloud Patrol - also good. The best mobile entry the franchise got imo. Simple as hell but it was a fun and technically sound timewaster without any microtransaction bs I remember (unless you wanted gold, which I think you could buy????)

Lost Islands - just a city sim with nothing special to it, with the typical boredom and microtransactions of the genre and not particularly charming assets et al. Lots of wasted potential too considering how few ideas and assets from Universe made it in. For a city sim there's also nothing really bad about it but... it's a city sim. Not a very good genre honestly. There's nothing to set it apart from any other city sim if you aren't already a Skylanders fan.

Battlegrounds - Yeah, this one is pretty awful and kinda deserves to be buried... took forever to get any update so they couldn't even do that properly but the game is boring as hell, it's repetitive, ugly, has no satisfying game feel or anything really interesting going for it.

SWAP Force - The Great Gaem. God bless. It's not without its flaws but I feel this was the only entry with jumping that kept a balance between it and the combat the series should focus on, and the combat was revamped excellently here. Plenty of content, even if unfortunately some is pure grinding (looking at the quests...). Last entry that didn't feel way too focused on the gimmick. Last one that really offered new goals for old characters. Again, it absolutely isn't without its flaws (I really don't return to it these days when I find the visuals so bland and because the story levels and even load screens are so long it's not the best to pick up for quick sessions, also anything I could play it on is packed away), but the overall package is pretty great imo.

Superchargers - lmao terrible game

Thumpin' Wumpa Islands - sorely overrated level. Bland platforming with lame "puzzles" (those statue and block bits- they aren't good puzzles when they're just following orders and they aren't good action moments with how damn slow they are, just an awkward combo of the two that hits the brakes on pacing but doesn't invite real thinking) and boring combat, with a similar easiness to SC's (not quite as bad since there aren't so many ledges at least, but the enemies feel really weak at least when using senseis, which is a shame because I thought some of their attack patterns were neat). It has some neat bells and whistles in those extra minigames (I would argue Chilli Pepper Run 1 is better than the actual level, but maybe I feel that way because it doesn't overstay its welcome) and it's a fun nostalgia trip but the level at its core is fairly boring. I can see how they tried to make it interesting by switching between 3D and 2D and having more side-stuff, and as negative as I sound I think the level is okay overall, but it doesn't take advantage of series' strengths with the lacking combat and more focus on its minigames and jumping around and (aside from RHCP1) those aren't really that great. The level is spread too thin.

N. Sane Trilogy - Poor remake of good games that also can't stand on its own. Larely ugly aesthetics combined with 2/3 of the experience having awful control, and some seriously outdated and slow level design in the first third make for a poor, fundamentally flawed experience on both an artistic and gameplay point (even though the original Crash 1 wasn't great, it at least always had the former to fall back on and it still looks miles better than NST... Slippery Climb is the worst artistic downgrade I can remember seeing in such a high-production game remake).

Battlecast- excluding this because I never properly played or honestly even watched it, but it honestly looks alright. The card art is pretty gorgeous but IIRC that was outsourced. Can't really say much about this one, especially since most card games are really boring to me personally anyway.

Hell, even the Wii U port of Giants was janky. They definitely seem to have more good and technically impressive ports than bad ones like that, but I wouldn't exactly consider the random hardlocking and increased glitchiness of Giants WU okay. SWAP Force on WU was kinda janky too. I guess they had a lot of trouble with the console and to be honest it's probably more to blame than VV are for those two ports, because the console was infamously bad to work with and their ports generally seem great.

I don't want or mean to rag on the entire studio because the people there actually seem great, but their library is... to say the least, it's lacking. People seem to like VV because of their long history, but imo it doesn't mean much when a lot of their work (recent or not) isn't very good. This analogy may be a bit of a strech, but I've probably spent tens of thousands of hours drawing and while parts of my art are better from things I learned along the way, it doesn't magically make me very good as an artist.