I use my Steam Deck daily, but more often than not I am streaming from my PC upstairs to my Deck. I get way better battery life, can play non-Steam things like Emulation with nicer outputs, and for graphic intensive games it's pretty good.
Having said that, I don't see myself upgrading for the next few cycles. The games I do play natively are running fine on Deck, and when streaming I don't need 4K 9388647832 frames so I think my current rig will be satisfactory for longer because of my Steam Deck usage.