I've never really used a steam deck for more than a few minutes, I do have Steam running on a couple Linux PCs though.

FWIW Anytime you have a smaller package it will limit performance, but they sell a lot of them. If your looking for 4k ray-tracing uber-PC gaming probably not the best choice, but if the "Switch" form factor is appealing it's a good choice. Lots of manufacturers make them now too, there's choices.