Unless you're dumping ROMs yourself of games you own...
I can only imagine the product manager telling HW designers that nobody cares about audio latency, everyone uses Bluetooth anyway and damn this thing must be cheaper and ready for production yesterday.
But controller support in games is still niche because most people just aren't going to do it. I believe Apple enforces it for their Apple Arcade games, because those have to run on Apple TV too, but outside of that there just isn't much interest.
[0] https://www.nintendolife.com/news/2022/11/the-nintendo-switc...
There are other devices, and other ways to measure the market size, but 114 million of anything is not a niche market.
[1] https://www.statista.com/statistics/1101888/unit-sales-game-...
> but there are a lot of heavyweight titles released for mobile platforms as well.
...like ? Every single mobile game that I found "good" usually launched on other platforms too.