Yeah, I never bought into the line that people were confused that a Wii U was a Wii add-on. That's never been a major problem for similarly named consoles before and anyone I knew all knew it was a separate thing. I think that focus on having to pay attention to two screens, as you said, as well as the severe under-powering for a home console of its generation and an abysmal launch lineup of games, all leading to an abysmal launch for the console itself and third parties deciding pretty quickly to mostly bail on it, led to its relative failure.

That said, I still have my Wii U and also have fond memories of playing it. Say what you will about the severe lack of 3rd party support, Nintendo themselves put some great quality games on it: all the Zelda games (including Hyrule Warriors and the BotW port), Smash Bros 4, the original Mario Kart 8, Mario Maker, 3D World, DKC Tropical Freeze, the list goes on. Sega was pretty kind to them too for a 3rd party: Bayonetta 2, TMS #FE (underrated, IMO, good TMS/Persona style gameplay even if its story is goofy... Expected more actual FE-related content though), the quantity of Sonic games (if not quality).