Ask HN: Why are most web designers have very simple and boring websites?

I'm a fullstack web developer and have been for the past 10 years. I never had a portfolio and prefer to upload my work on github. But times are changing and i decided last week to make my own. I've literally created over a hundred website through my career, but when it came to making mine, i was lost. So i decided to look at world known web designers portfolios to be inspired, hopefully. But the thing is, most of them are generic and boring! I really don't understand this, is it like a trend or something?