Full 32 bit on 64 bit Unix support is a big thing in my opinion, even though most people won’t notice it (as an “extra” this also will allow running 32bit games on osx games and proper wine support on arm64 devices like your phone).
Also the additions to directshow will get more (older) games working properly.
From what I read this was some great work in the foundation of wine and hopefully accelerate their work even more.
When a new game is released I usually check if it’s steam deck compatible, if it isn’t for no specific reason (like, a 2d platformer, I’m not going to expect a high fidelity 3d game to work) I’m way less inclined to buy it. The market is there and really should be picked up.