I will still ride no hands on occasion, but just for a moment to stretch or something. I don't do it even a fraction as much as I did as a teenager. I don't bunnyhop curbs anymore either, usually.
It is less common than it used to be to see people riding no hands. I get the feeling a lot of people can't do it. When I was a kid, it was just a trick that everyone kind of was expected to learn (along with popping wheelies...). With the enthusiasts, whether club rider or racer, it was kind of normal to be able to ride no hands more or less indefinitely.
IMO it is a useful skill to have that will improve your balance and control of the bike. Can take a bit of practice.