Yes because even the "easiest" of them to use the Steam Deck can easily run into its fair share of PC gamer problems. I've never once had my Switch boot a game with the incorrect button config, there's no need to fiddle with output resolutions on a game by game basis, pairing controllers for local play always works flawlessly etc. And this isn't even getting into trying to find the best settings for optimal battery life/noise, adjusting TDP, frame rate cap etc.
There's a lot of value in handheld PCs but they just don't have the ease of use a console like the Switch does.
Is nintendo's brand strong enough to withstand them ? It very well could be, but I think they have serious competition now.