This is all subjective, of course, but in my opinion, iOS 7 was an aesthetic disaster and the start of a long downward spiral of Apple's GUI design.
Unfortunately, today's iOS aesthetic is pretty much the same and hasn't evolved much visually in 10 years. We didn't need to go from leather stitching and linen to flat, cold, boring, jellyfish interfaces with tiny navigation arrows, vast blank spaces, and a poorly implemented Dark Mode that took years and years to release. A happy medium was in there somewhere. They continue to pile onto the iOS 7 foundation, but really, iOS needs a major design overhaul.
Sadly, Apple is doubling down and continuing to extend this design language and functionality to where it doesn't belong, in macOS. They are catering to the iPhone buying masses to cross and/or upsell other products. 'Look, it's like an iPhone or iPad but in a laptop, so now I know how to use it!'
I never thought I would see boring, flat, lazy, hard to decipher and uninspired tile icons, multi-click notifications with small navigation arrows and 'x' buttons, and small, monotone glyphs and icons in an iOS style system preferences, that all look a bit too similar, in macOS. But, here we are.
Having said that, I will take iOS and macOS over anything from Microsoft or Google. I just wish Apple would bring a bit more refinement, depth, subtle texture and personality back into their interfaces. Even adding something as simple as a fade-in and out effect as you navigate to different system setting windows, etc.
But, what the hell do I know, they're bringing in billions and sitting on a 30%+ profit margin, so catering to the masses, while not great for those of us who remember the days of Thinking Different, is good for their bottom line, for sure.