I have a good gaming PC in my living room. Still I find myself on the couch with my steam deck very often.

I've found myself using my deck way more than my PC. I've barely touched my PC since I got my deck because it can run most of the games I want to play, either natively or via proton/wine. Granted, most of the games I've been playing recently are either slow-paced and can be played with the deck controller (like The Sims 2, or OpenRCT2), or are better on a controller than m/kb (like animal crossing or mario).

I definitely still have things I still need my PC for, either because they won't run on my deck (VR stuff), are difficult to play on a deck (mainly shooters), are more suited for a physical keyboard (filling out forms), or the deck can technically handle but doesn't have performance to do it well (like 3d modeling or game dev). However, my deck has become my main PC when it comes to games.