>Hasn't that been Apple's norm for a few years now?

Not to this degree.

I’ve had 3 memory leaks in native apps, including the calculator. There’s basic alignment errors pretty much everywhere. In many places text can become fully unreadable (black on black, white on white, text over a transparent background with overlapping text below…).

It’s not slightly lowered quality, it’s the kind of inconsistency you expect mixing custom launchers and icon packs.