Emulators in speedrunning. Should they be banned or not? What are the pros and cons for using them?

Usually, the only thing that comes up in emulator discussions is whatever the emulator is accurate or not to actual hardware, usually purely with lag and loading times, but there are also many other things to consider when comparing the two. Yes, emulators will not be 100% accurate to consoles, even if they can get very close to matching the CPU and such. The thing is that consoles aren’t completely accurate either, as in two systems can produce very different results, even if it is “the same” console. Things like how warm the system is, the model number and how worn out it is, can all have impact on the timing. If it’s too warm, it could take longer for the console to process the game, which could lead to for example longer loading times. I believe there has never been an instance where this has been important in a speedrun case and I honestly doubt that there will ever be. For runs with very tight records, a single frame could be the different from WR and 2nd place, which could technically have been caused by the console being too warm.
*no actual data currently to back this up, but by asking an engineer about it, I’m sure such could be provided or gone into detail of. I’m just thinking logically about this matter.*

Another example being loading times for disc-based systems. The Wii, first edition model, I had could take a very long time to load screens, but when I tried the same game on a newer model, I noticed huge difference. Updating the console’s software can also make a difference in this, in both ways.
When it comes to emulators, depending on the computer you are using it can sometimes run in less than 100% speed, making it slower for the player. As usually, the more accurate emulators (like Higan for SNES) take up more CPU than a less accurate (Such as SNES9X) emulator. Though for many emulators, especially those made for TASing purposes, there will be a Frame Counter. This one will always be 100% accurate, no matter how slow your computer is running the emulator. If your run is 3600 frames (1 minute) long, but due to a slower computer, the real time was 2 minutes, you could still go by that frame counter for an exact timing. You could even fast forward the emulator, to faster skip through cutscenes or just for fun, and the counter will still be accurate.