I suppose Apple truly intends its MacOS to become more mature and streamlined. I also loved the beauty of Leopard and Lion versions. I don't think that making a

I suppose Apple truly intends its MacOS to become more mature and streamlined. I also loved the beauty of Leopard and Lion versions. I don't think that making all icons flat and less colorful makes Apple's products more mature. The decision might have been made as Apple decided to move from glossy devices to mat, so later after that all the icon designs also moved from glossy to flat. It took almost 10 years, btw.