To be fair, Xiamen was very clear the few times I did fly there.
I was in Chengdu and thought much I what I read regarding the author's experience with Tianjin was similar to my experience with Chengdu/Sichuan Airlines.
Regarding the translation of manuals, we had a guy get nailed with a large fine due to a poor translation of manuals. He followed the Airbus FCOM, but the translation into Chinese was bad, so the company argued that he violated a limitation and suspended him and fined him (along with the public shaming). The proper, original, Airbus FCOM wording was not enough to protect him.
Anyway, glad you had a great experience with China. It can be financially very rewarding if you are in a good position to handle the fun of China. I could be persuaded to go back for a short time after my kids are grown, if the options are still good. But I am in no hurry to go back.