I would wait for months before buying any Zepp watches.
My only good news was to be able to unpair and pair the X to a new phone. Lost some of the watch settings, though.
If you want notifications, you need to be connected to your phone. Having said that, i agree that the watch should be mostly independent of your phone.
Perhaps this is a language or cultural problem in communication? The initial price for the X is not that bad, but I would not pay full price now, with other watches from Amazfit available now.
I can see functions that updates continuously can eat battery life, but not ones that are updated daily or a few times a day. Displaying seconds could be a drain.