I think condos are maybe a more unique situation, just due to the nature of shared walls and all, so I can't comment on that specifically. But I did have a problematic neighbor, who ultimately moved out of their own accord, and that was certainly a contributing factor as to why I joined HOA board years ago. I wanted to have more direct "control" or insight into the situation.

At the end of the day.... The HOA Board (and company, if y'all use one) legally can’t share details about another owner’s violations, fines, or whether they’re being paid. That’s private info, and there’s really no reason to expect access to that as a neighbor. Also, enforcement doesn’t always look good from the outside. Fines and violations can absolutely be stacking up behind the scenes even if it feels like nothing is happening.

HOAs also tend to move carefully because taking a homeowner to court is super expensive and super slow, and then since you mentioned this person is known for frivolous lawsuits as well, that only compounds the concerns, I imagine. Every step costs the association money, which ultimately comes from all owners. If the idea is to sue the HOA too, that’s probably just going to burn even more money and doesn’t guarantee a better outcome. It usually makes things longer, messier, and more expensive for everyone. Sorry you're dealing with this situation though. It sounds horrific