Underlying kernel aside, I think that the Steamdeck's SteamOS is an excellent example of how "easy to use" != "smaller feature-set". I've heard countless times from apple dudes that the reason that their stuff allegedly "just works" is because of the lack of some functionally that if present would overwhelm the user. You know, as if ios and android don't share fundamentally the same user interface principles. But they do have a point, a green user can be overwhelmed when presented with a huge feature set all at once. Yet, despite SteamOS literally having a full-blown desktop environment, the UI frankly is way less confusing than my Xbox. It just goes to show that it's not about the number of features, it's about how they're presented. Power users don't mind digging into a (well designed) settings menu to enable some advanced functionality, and keeping those advanced features and settings (with reasonable defaults) hidden around the corner behind an unlocked door helps the newbie get started with confidence.