From vB4 onwards it has becoming more and more of a hot pile of crap.

XenForo is where it's at. Never used IPB but heard they're slipping.

Yep, works great. Nobody uses it for anything new though.

The last vBullitin site I used was hacked and never came back online. The overhead from running forum software in the age of mass automated abuse is just too great. It's really hard to justify the value of a forum that gets hacked, spammed, costs money, etc when Discord is free and works better for most people.

Presumably mobile compatibility was the issue, no? Everybody nowadays wants to do everything on their phone.

Also, didn't vBulletin have a lot of spam and security issues? It's kind of like WordPress in that using it is nice but managing it is hell.

ProBoards exists and is nice to use, but it's not obvious to me it does anything better for software than Github issues.