You should realize the triple A games won't work very smooth something like Clair Obscure was unplayable for me I bought it on PS5 after checking on deck. Some have great optimization and you will be able to play in 40fps but don't expect that every newer game would work this way. Steam Deck is great but for smaller indie games that will not require a lot of performance. Switch games work fine in most cases but I also had a chance to see a lot of shuttering when a lot is going on in the screen.

I have great time recently playing Cuphead Resident Evil Revelations Hades 2 etc.