"The idea is to introduce real-world entity to UI/UX"

No, that should be REINTRODUCE. The whole point of a GUI is that it's intuitive. The depicted controls should bear essential visual qualities of real-world objects, like buttons. Does the button look like it's sticking out from the background? Then it's not depressed. And so forth.

"Flat" UI is an idiotic regression that has set GUIs back decades. Come to think of it... did they ever suck as much as "flat" UI? Now we have entire interfaces that are an Easter-egg hunt. It's pathetic.