Whats your use case?
Was somewhat recently considering a linux laptop myself and ended up deciding the steamdeck fit my needs well.
A dock + portable keyboard & mouse for when i need to do typing or w/e, and a fun handheld console for when i want fun.
That being said, depending on what your “older” laptop is, it might not actually be much stronger, or it might be wildly overpowered for what you need.
I can not state my love for this game enough, it may not be flawless, but everyone working on it is doing it for love of the game, and is doing great work.