There was a golden period of OS X roughly between 10.5 and 10.9.

Up to 10.4, windows were too textured: stripes, brushed metal.

In 10.5 till 10.9 we got to enjoy the beauty of Aqua paired with calm, tasteful gray window frames and controls that had visible depth.

From 10.10 till 10.15 was okay-ish: the flat took over, but we still had contrast and shapes.

Starting from 11, everything became rounded, low contrast and lost visual cohesiveness.

10.5 till 10.9. We didn’t know how good we had it

@nikitonsky Yes, because everything that was great about Apple was a result of the leadership of Steve Jobs, and once he died, Tim Cook took the company in a very different direction. Everything Apple is now a pile of shit. The last iPhone Jobs was in charge of was the iPhone 5, released in 2012. Once the pipeline emptied, by late 2013, everything Apple was under the control of Tim Cook.