I loved china but eventually had to come back due to mostly air quality and some career issues. I’m back in my favorite American city at least, but having spent 11 years out (2 in Switzerland and 9 in china), I feel anxious (and I came back just in time for Trump 1, ugh).
Air quality in china has massively improved over last couple of years... Oc not as fast in all cities but might want to update your priors :)) (if that trump 1 is not a typo 8 years is a huge difference)
Beijing is better now but still not good enough. Anyways, we had a baby on the way in 2016 and my wife was pretty sure Beijing wouldn't work out for his lungs.
Again i wish more people did what you did and experience life outside of their norm. Indeed it's not for everyone but the point stands. You made the choice to come back after experiencing something else for a while.