'Happy' hosting with Airbnb appears to require some allowances, otherwise it will be impossible to ever achieve happiness with it or have fun doing it.
1. Airbnb: Granted it is oftentimes not the sharpest knife in the drawer, it is still run by now-middle-age kids who came up with a marketing angle 10 years ago, not pre-selected certified rocket scientists. No different than Facebook, and a few other examples.
2. Guests: We are dealing with the human race, (you know, our fellow man), and no individual entity is solely responsible for, nor can guarantee its unpredictable behavior. A guest gives 5 stars in all categories, yet 4 on Overall; I mean at what point did they become that confused, or that stupid?
3. Superhost: Airbnb is trying to come up with a way for it to mean 'more' by becoming less common, thus the new 4.8 benchmark, how else should they do it?
4. Star Rating: Yes, unfortunately that 4.8 is highly dependent on more than a host doing a good hosting job consistently, but also on the intellect of its guests and on pure luck that some sub-humans it gets do not leave #1s across the board (usually in retaliation), and Airbnb treats those reviews as perfectly 'reasonable'.
Airbnb doesn't seem to recognize the wide spectrum of human intellect or intentions; if they do, they are making believe it doesn't exist.
The above only offered as food for thought.