Skeuomorphism was the coolest kid on the block back in 2000s. Having adopted Flat UI in 2010s it seems to be wearing off in 2020s. Is Neumorphism going to pick up? Visual design is like fashion — it comes and goes.
User Interface Museum is a collection of UIs of popular desktop and mobile apps showcasing how they’ve changed over numerous years — plenty of examples of design successes and mistakes to learn from.