Many years ago my wardrobe was all black. Literally. I was young and broke and living in a city so it was very practical. It didn’t show dirt, it was ultimate mix and match, and I thought it looked edgy.
I still favor black as my staple neutral. However, I have a bigger clothing budget, so have expanded to grays as my neutral sometimes. And have incorporated more color in general. But black is part of my formula 90% of the time.
My teenage fashionista daughter has very little black in her wardrobe. She has a very different lifestyle than mine (school!) but even my coworkers wear less black than me.