Depends. I have a good desktop gaming computer and a 4k monitor. DLSS makes the two work together nicely... and yet, sometimes I just want to play on the Deck. A big upside is how the entire system uses up to the same power as my gpu does at idle, and I don't have to add the heat generated by the monitor: brilliant way to keep the room temperature in check.
Being able to play anywhere I want (couch? why not) is a great motivator.
Saving this for later, you got my attention with the combo of Mac and portable. Anything I can delete a single folder to get rid of in case I don't like it, is a great plus.