Ah yes, the operating system everyone points towards when they talk about the best thing Apple’s ever made, Mountain Lion.The rumored iOS 19 "glassy" look sounds like yet another variant of that abomination known as flat design. Flat design is tasteless, which is not a surprise considering that it was pioneered by Microsoft. Yes, Tim Cook allowed Apple to copy Microsoft. His new nickname should be Tasteless Tim.
Please, Apple, rehire the most Steve Jobs-like visionary, Scott Forstall, and go back to iOS 6's full-fledged skeuomorphism. Skeuomorphism gives visual cues that make it the most intuitive for people who've never used a computer or smartphone, like many children and elderly. iOS 6 and Mac OS X Mountain Lion were the pinnacle of skeuomorphism, and were based on three decades of painstaking user-friendliness research.
Also, I have no idea where you got this idea that Mountain Lion was “ based off of decades of research” seeing as Mac OS X had already gone through four different design phases by Mountain Lion, Scott involved with all of them.
Most of the dramatic usages of Skeuomorphism weren’t added until 2011, by which time Tim Cook was already basically running the company and Mac OS X had been in use for over a decade.