I use emudeck and think it's great, but I'm not naive enough to not see how proper steam integration would make things better. Case in point, it would be awesome to have community support for things like controller configs on certain platforms such as N64.
But also, Dolphin was also the only emulator which needed a lot of additional tweaking from the EmuDeck defaults. Wii games have a combinatoric explosion of control schemes (wiimote, sideways wiimote, +nunchuk, +classic controller, +pro gyro thingy, balance board, light gun, etc) and there are really no sensible defaults. Dolphin won't remember layouts per-game, you need to do some launcher gymnastics to make that happen.