Consider this, everyone at whichever skill level they're at, benefits from applying simplicity to their designs. Also, everyone at any skill level will have a tendency to think the work they are doing is actually deep enough to require the complexity when it reaches the border of their intelligence.

I dont know if you only have genius friends but I can tell you many stories of things people thought warranted complexity that I thought didn't. So whatever you consider hard enough to warrant complexity, just know there's another smarter guy than you thinking you're spinning your wheels.

Also it's an impossible conversation to have without specific examples. Anyone can come and make a handwavy case about always simplifying and someone can make a case about necessary complexity but without specific example none can be proven wrong.