The answer is really just any game that is well suited to controller + TV. The aspect of streaming to the Deck is largely irrelevant since, as you mentioned, the experience feels so close to native.

I used this type of setup to pkay Harold Halibut, the Quantic Dream games (Detroit, Beyond Two Souls, Heavy Rain), Elden Ring (+ other soulsborne), and anything else that doesn’t run at its full potential directly on the Deck.