Does the Chinese dual-sim iPhone have any restrictions or downsides compared to a US or EU model? I might consider it as my next step if I can let go of the iPhone 8 and its fingerprint sensor.
Which region are you in and which region is your system set to? I always thought things like this were determined by which region you select when you set up the phone (or something similar like detected via GPS/network instead of being bound to the hardware itself).