I loved and still do love my Wii U and still use it semi regularly to this day. There was something about the Wii and Wii U that was lost on the Switch. They just had that special Nintendo "feel" and vibe
IMO it's because Switch adopted the great XMBC UI. That's probably why. Wii's channels for me (and I feel most based on how I saw others use their Wii) were useless...