Steamdeck is more console than x86 PC is a platform. I get what you mean, but PS4 and PS5 are too technically x86 PCs. Most modern games’ tightly coupled target are actually APIs they are using.

It can be one click in a compiler to compile the game to ARM PC, but it’s a different story when you port your game engine to console, where you have to implement the same features using different APIs. (E.g. Raytracing, storing game data, connecting to profile, implementing multiplayer etc.).