I think there's a bit of black/white thinking for some people talking about being anonymous online. I'm realistic. I know nothing online is truly secure. I know there could be a breach and my personal info found out. I'm not thrilled with that, but it's the world we live in. I don't worry about it though, just like I don't much worry about being struck by lightening (random example).
I do not really want people in my real life finding me. I would not like coworkers, neighbors, friends, etc, finding my posts here. Is it possible, sure? Is it likely? Probably not, because I am very, very careful. I don't completely hide where I live but never narrow it down to an area that covers several states. I talk about my job(s) in a general way because many, many people have the types of jobs I do. Except for my last job and that's very unique and I avoid any and all details that could point me towards that job. I don't use my pet names and do all sorts of other things to obscure my identity. Here's where I think some posters view this issue a bit black/white. Is my identity completely protected? Of course not. Could a hacker find it? Sure. I doubt my friends, neighbors, coworkers are going to be going to that level of hacking to find out about me. If they are, I have larger issues.
I really, really don't want my family or origin to find me online. They have twice in the past. So, I know it can be done. I was younger and less careful. Both times they found me online, it was used as a way to attack me. Again, they aren't hackers. And even if a hacker broke into this site, then what? There not contacting my family as nothing much online links me to them. Maybe they just post a list of information online that includes my details other members here. That's a lot of data to go out, and the chance that my family would find me in it is pretty slim. If a breach happened and my info was posted, could they connect me to it. Maybe. But the chances of all the right cards falling into place are slim. Life is full of risk and I will have to live with that level of risk
I could see myself using the anonymous function if I felt I was getting close to revealing things that could match the cyber me that exists here to the me that lives in the flesh.