References:

https://www.wsj.com/amp/articles/in-switch-nintendo-embraces-games-with-a-rougher-edge-for-new-console-1507908652

https://mantan-web.jp/amp/article/20171013dog00m200027000c.html

http://asia.nikkei.com/Business/Companies/Switch-flips-the-script-for-Nintendo?page=1

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Pulled from the WSJ article:



I wanted to add a few things together to narrate how things are going with Nintendo regarding third parties.

First off, the WSJ article: In Switch, Nintendo Embraces Games With a Rougher Edge for New Console

[Quote]Nintendo Co. is encouraging some producers of violent or risqué videogames to provide content for its Switch console in an attempt to shed its image as a maker of devices just for families, software developers say.[/Quote]

Some of the software titles referenced for this article:
[Quote]
The software lineup for the Switch includes “Nights of Azure 2: Bride of the New Moon,” an action role-playing game featuring lightly clothed female characters; “Shinobi Refle: Senran Kagura,” a game primarily for the Japanese market that allows players to massage young women; and “Doom,” a bloody shoot-’em-up game.[/quote]

Nintendo has encouraged developers to bring their mature games to Switch.
[Quote]
Developers say more titles for mature audiences are coming after Nintendo encouraged them to publish a wide range of games for the Switch.[/quote]

Takuya Aizu of Inti Creates is one such person, encouraged by Nintendo to release Gal*Gun 2 for Switch.
[Quote]
Inti Creates Co. said last month it would release “Gal*Gun 2” for the Switch early next year in the U.S., Japan and Europe. The company has released other titles in the series for PlayStation, Xbox and personal computers. In the game, players try to hit young women with pheromone shots.

Takuya Aizu, chief executive of Inti Creates, said he initially assumed Nintendo wouldn’t be interested in the game, but in discussions with the company, it welcomed the idea of bringing it to the Switch. “I thought it wouldn’t be possible to release such a game for the Switch, but surprisingly, Nintendo gave me positive feedback,” Mr. Aizu said.[/quote]

Others mention Nintendo were passive about this in the past, but would be described differently today.
[Quote]
Other software makers described a similar message. One executive at an outside developer said that when it came to risqué or violent titles, Nintendo “was passive until now, but that is no longer the right word to describe its stance today.”[/quote]

Nintendo wants to cover different audiences.
[Quote]
Nintendo said games for its machines covered a variety of playing styles, genres and ratings. “As with books, television and movies, different content is meant for different audiences,” the company said.[/quote]

Remember that January presentation? Shinya Takahashi did it for you.
[Quote]
At a Switch presentation in January, the venue was enveloped in a nightclub-like atmosphere. Shinya Takahashi, a Nintendo executive, told The Wall Street Journal at the time that the aim was to attract grown-up game players in the West.[/quote]

[Quote]
“Nintendo has opened its window to more developers, and it has gotten much kinder to companies new to Nintendo platforms,” said Takayuki Fujii, the producer of “Gal Metal.”[/quote]
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Now onto the next article from mantan-web. There was an interview with the CEO of Gzbrain which is known for Famitsu. He had this to say regarding Japanese third parties supporting Switch.

Google Translate:
[Quote]
Regarding the weaknesses of "Nintendo switch", I cite a few of the game companies "third parties" who develop dedicated software other than Nintendo and its group. However, Mr. Hamamura said, "Initially, companies that had been witnessing the sale of the Nintendo switch started working on dedicated software at the same time in the past few months, and they will have software in about 2019."[/quote]

So there are third parties that are late to the party but it's not as though Nintendo had ignored them, I reference an old article from Asia Nikkei of which a very likely major Japanese third party was asked by Nintendo to bring major releases to the Switch:
[Quote]
The company [Nintendo] has sought to make it easier to create games for the Switch by expanding the scope of development tools. It is also pushing developers to expand the Switch game lineup quickly. An executive at one software company said Nintendo asked it to introduce major releases "as early as possible."[/quote]