I have 2 4K tvs, one used as a monitor. I’m now rewatching some 70’s - 80’s shows. When the intro starts, I’m acutely aware of the low res, but as soon as the show starts, I get into the content, and I really don’t notice the resolution.
If you focus on the resolution instead of the content, maybe the content is not that engaging.
Humidifiers are simple and cheap. Maybe the cost of a 2 in 1 wouldn’t make commercial sense.
Also, it would probably need two water tanks, as I imagine you wouldn’t want to use the drain tank as a clean water source.
Just guessing here.