Also, keeping current deck hw specs will allow developers to focus on single device when optimizing game for deck. Some games (i.e. cyberpunk 2077) already have dedicated "steam deck" graphics preset. Some (i.e. sons of the forest) have steamdeck: true/false variable in debug window. Maybe we'll see dedicated deck support in some game engines? Who knows.
[1] https://www.theverge.com/23499215/valve-steam-deck-interview...