As an advice, i hightly recomand to not sleep on the steam deck players, they are not that few, and most important they are really into this type of games, looking at the top played game of steam deck we can see a lot of isometric game ad the two Hades, Diablo 4, V Rising, the same Last Epoch even if it’s not verified, etc…, these games usually placed in a lot higher position in these steam deck chart compared to the generic one that count also the Steam PC player.
So, have an actually optimized version for Steam Deck will be great, the actual one suffer to much for lack of memory, with lag that even with the minimum possibile setting make the game go to 5/10 fps, and eventually freeze the Deck, when in some other zone the fps are well over 40. I guess is a borrowed problem of the PC version that anyone complain about, even i have a similar problem playing on PC, even if less effective, but for steam deck is even more amplified. But considering that the Steam Deck is one, should be a lot easier to solve it if you really want to do it, having a fixed hardware that never change.
Please think about it.