I'm a US academic, so there's not much choice but to have a website. It has definitely led to increased learning and new connections. Hard to say for sure, but I suspect it has opened some side opportunities.

I'd have a website even if it provided none of the above. Think about how good it feels to have a deep conversation with someone on a topic you love. That's what it feels like to write for my website. And in 2023, the cost is basically zero.