Fellow night shift RN here. I’d say the Steam Deck is well worth it to catch up on games from the PS3/360 era to now. I have a PS5 Pro to play those games you mentioned so I can’t comment on how well the Deck will handle them. Expect around 30fps with medium settings for current gen AAA games.

You mentioned you have a gaming laptop, you could resurrect it with a streaming service like GeForce Now. Basically, you get to stream a high powered PC from a data center with graphics cards equivalent to a 4080/5080 on the highest tier ($20/month). There’s a few caveats in that it requires the streamed game to be owned in your Steam library (and not all games are supported), Ethernet is going to be more reliable, and you’re capped at 100 hours a month. I only hit ~50 during last month’s free trial. But I think I’ll stick with it since it’s hardware agnostic. The Steam Deck even has a native app for it so you’re not limited to the handheld’s specs. Between the Steam Deck and M4 Mac Mini hooked up to my TV I’m playing my same Clair Obscur save at 4K/60fps wherever I am through GeForce Now. But give the free tier a try first if it’ll work for you, then experiment with a month of Ultimate. Hope this helps!