I thought I'd be a mostly docked player as I've spent very little time playing handhelds in my life, but lord has the portability won me over. It's a joy to play the Switch on that handheld screen, and while initially with BotW and such I played primarily docked, lately I'm almost always undocked.
I'd definitely recommend to people who think they're mostly not interested to still get the portable version and give it a shot on occasion. It might be a decent idea to have a permanently docked one, but that might not be a good look for image of the Switch that Nintendo is trying to cultivate. Could you even call it the "Switch" at that point? lol