Honestly, I like reading them sometimes to kind of get a vibe from people, like it takes all of maybe 5 minutes if you're trying to make an actually good about, I didn't really care much here, so it took me 1 minute to write all the stuff I could think would be interesting, another to organize, and then posted.
But ultimately, like Yuri said, if someone has a blank about, it's kinda just lazy in my opinion, but I do also understand that if someone has early to mid 20's and female in their bios, then they'll get flooded by the creep tsunami of weirdos.