

Decks went from GDPWin with intel HD 615 integrated graphics, running desktop windows in 2016 (we were amazed it could run 2011’s Arkham City 25 fps low (definitely playable! lmao)) to Steam Deck where people are still reasonably posting about it having console parity.
RE “outdated soon”: this is a $350 handheld x86 computer with an APU powerful enough to drive complex 3d games at 720p. People are going to be buying Steam Decks until they stop making them. Capability and performance per $$ is extremely good for numerous use cases, including people who are gaming like OP.
RE devs optimizing for SD/Switch2/XBS: i hope OP is right? definitely where non-AAA studios are going to be aiming, but AAA studios have weird corpo masters who rarely operate in ways that would make sense to cool people.
you are going to be fine! linux has better compat than windows now unless you use a ton of proprietary, locked software. your average linux distro can do steam gaming pretty well, and there are distros like bazzite and garuda and popos that do some or all of the configuration for you (based on your hardware and usage).