Steam Deck as a primary gaming console?

Hey all, I am brand new to SteamDecks and even PC gaming in general. I’ve been an Xbox guy for 10+ years. I have some cash I wanna spend on either a Deck or an Xbox Series X. I’m leaning towards a steam deck, purely because I can play it anywhere (I travel a lot for work) and I don’t wanna be always locked in to playing on my couch downstairs like I would be with an Xbox. I think a steam deck would be a perfect purchase and all the games I want would be available (GTA6, Halo, Marvel Hero’s, Black Ops 6, etc.) but curious if I’m missing something?

The one thing I’m nervous about is a steam deck gonna last me 5-10 years like an Xbox series X would, or am I backing myself into a corner? I also play a lot of BO6 with my friends who are a mix of Xbox and PC gamers so that’s important.

If you had to choose a dedicated console for $550 or a steam deck, would you choose the deck still? I’ve never been a PC gamer, always Xbox but seems like there’s a lot of options here!

Another question is how is the experience playing on a tv with the deck hooked up on the dock? Is it laggy or is it smooth? Graphics are not a huge deal for me, as long as it looks good enough and isn’t choppy, I don’t need 120+ FPS.

Appreciate the input in any way!