I never assumed David Harbour was "wholesome", I just thought he was hot.There is soooooo much parasociality in the Stranger Things community, it's unsettling even by fandom standards. On top of that, David is a very likable actor and often takes roles of the "well-meaning dad" variety, so it makes sense that his fans project such wholesomeness onto him.
One thing I did like about him and Lily hooking up was their Vegas wedding. I'd enjoy that!