Probably. I'm just pissed off because this feature was working perfectly for me across several devices. Deleting messages, changing Do Not Disturb settings, and so on all synchronised immediately and correctly. It was great. But because some people had issues (not that I know who these people are because I've seen very very few complaints!) they have removed it in a way that completely ****s over everyone who used it without issue.
It was also the only reason I bothered trying out iOS 11 beta! Doh!
I feel ya. I'm ready to call it for now, it should have been done already unless the size is being misreported. I might try it again when I get home so I can have a controlled environment and see if there's actually any throughput on my routers while this is going on. Maybe some info can be gleaned from some packet capture.
At least for now it looks to me like you're right; it's not working. I get the spinner on "Turning off..." At least you're not the only one, right?