Yeah, there’s really no reason why it shouldn’t have been called “God of War 4” when it’s in direct continuity with the rest of the series.
I honestly think game developers do that out of misplaced concern that newcomers will be less likely to play games if they know it’s an entry to an established series. Meanwhile, new gamers are born all the time and have been jumping into established series without hesitation for decades now, so if that were a legitimate concern than sequels woukd consistently undersell, not break records.
So yeah, “Overwatch 2” works just fine for me.