The knock on Nintendo has always been that they focus too much on their first party games, and their third party support is weak. But, that strategy seems to have paid off for them. No matter how much Sony and Microsoft want to gobble up, Nintendo's still gonna have Mario, Pokemon, and Zelda.
Actually one of the things I like most about the Switch is that it has a lot of really good third party games; Monster Hunter Rise, Witcher 3, Doom 2016/Eternal, Hellblade, Ori and the Blind Forest/Will of the Wisps, 13 Sentinels, Wolfenstein II, Crash Bandicoot 4, Yooka Laylee and the Impossible Lair, etc.
It may not be on the same level of support as PS or Xbox, but combined with Nintendo's first party output, it's enough to create one of the best libraries of any Nintendo system ever in my opinion.
Bet with Liquidlaser: I say PS5 and Xbox Series will sell more than 56 million combined by the end of 2023. (And over 130 million lifetime)