Let’s face it, the “new, streamlined, visual identity” is just a copy of iOS, but mixed with android so it is just awful. I don’t know why they would do that, yes at some point system apps will have a common theme, but it will be so different from all other Android apps which follow Android design guidelines. We will end up with a Huawei like UI, which is ugly and stands out from the rest of the app ecosystem.
Their goal is to make a system easy to use for non tech people, so they chose to remake iOS. But I don’t see when did iOS become easier to use than Android, it is very subjective.
I just hope they never touch system settings and clock as these are the only default apps I use.