A lot of the controls are unreadable depending on the background behind it, for example. Which is crazy. Sometimes it's also hard to figure out if something is a control, part of a site/application, a visual bug, or something else.

They've even doubled down on it, I don't see this going away in the next 2 major OS versions. I expect them to have a lot of WWDC sessions about it again this year.

That said, Apple's own apps are a crazy mixed up mess of different design systems and technologies, so maybe it will all fall apart and something new comes along in ±3 years time.