What do I mean by this?
I bought the GameSir G7 Pro. This controller has back buttons, TMR sticks, gyro, haptics, the whole suite. Only problem is that haptics, gyro, back buttons don't have a supported Linux app to make them work. Steam input isn't enough to fix this either. If I want to take a picture in-game, I can't. The experience is half of what I expected it would be.
The new Steam Controller is coming with all of this natively supported on Linux, and more. While it might not have as premium feeling buttons or d-pad as the G7 Pro, I think that along with the trackpads and puck, and all the features I want working out-of-the-gate, with Steam Deck layout compatibility... This is easily the best go-to Linux controller.
I had the same issues with the Switch 2 Pro controller as well. So this isn't just GameSir problems.
While Xbox was fine on Linux, their controllers don't really feel premium like the G7 offering. So it's a trade off of what I care about.
I think that a lot of reviewers are kind of missing the value point, which is Linux and Steam Deck compatible layouts. Anyone who has used a Steam Deck knows how insane having custom layouts can be, with custom weapon wheels via trackpad, and other such layouts.
Now I'm just hoping I can easily get this controller in my country. Luckily the steep price might turn off people so hopefully they have good stock.