If you want to be creative, you should make art. I love art. I think it's a great idea for people to make art.
If you want to make a GUI, it should be familiar. Extremely familiar. It shouldn't invent new ways to interact most of the time.
It is well-known that "intuitive" in UX almost always means "what I'm used to". If you're regularly "innovating" in UI design, you may be making the product harder to use, maybe much harder to use.
It certainly isn't unheard of for new ways to interact with computers to be better than the old, but they are usually tied to new physical aspects of our tools: Touchscreens needed new ways to interact, and maybe there's still some room for creativity there, but not much. The mouse obviously required innovative ideas for several years. But, also, the odds of your wacky new idea being the right way to change how people interact with computers are pretty low, unless you're working at FAANG and have a UX research team and budget to test it.
You can get creative in how it looks, but you cannot get creative in how it works.
I agree somewhat, there's a common language for building products that most people understand and expect.
Innovation comes from the ways people differentiate, without straying too far from the tried-and-true patterns. It's the tiny decisions that situate UI elements and yes, reinvent the wheel sometimes, that can tip users over to whatever you're building because you did it better, or in a way "most" (the average) never thought of.
If people aren't creative in how it works, then really they're all just making the same, boring products, without truly competing against anyone in a meaningful way in the problem space. Visual appeal isn't a sole differentiator.