You're entitled to your opinion.
Yeah, except it's not opinion but rather fact.
But of course you are entitled to feeling entitled.
The powers that be at vbulletin can't even fix their own product. How is anyone else supposed to, given the limited access to the back end that we have? There is only so much that can be done with the software by the admin team or anyone else. I have an administrator on my forum who is a (brilliant) computer engineer and programs for Google full-time, and he just shakes his head at vbulletin. (I also have one who does nothing except manage moderators, make decisions about rules, and deal with difficult members - of which we thankfully have few. So not every admin has to be a techie. It's generally not a high-paying job.
So short of breaking into vbulletin home base and re-coding their product - something I am sure they would probably be grateful for - there are really only 2 things to be done about the thread problem: 1) limit the length of threads/start new threads for those long ones with the constant issues; or 2) change your user cp/display threads such that the newest posts are at the beginning rather than the end. Those are admin decisions as far as I'm concerned.
We used to use SMF on my forum but switched to vbulletin (we had used it successfully on a forum back in the late 1990/early 2000's) version 4.x because we were having security issues with SMF, particularly their add-ons like photogallery. At the time (and this is still true for the most part), at least vbulletin was keeping up with security patches. That was our most important criteria. At the time we switched from SMF, software such as XenForo was pretty new and fairly expensive. Switching software without losing any data or features is a monstrous process, and you may end up trading 1 problem for 5 different problems. And then you have members who whine after the fact "because they liked that particular feature on the other software better" and so forth. BTDT. So I understand why they are avoiding switching to a different software.
Didn't mean to attack you; sorry if it came out sounding that way. If you have experience with this software then I'll definitely respect your thoughts on it. It just tends to be a trigger for me, because I do not believe (based on experience) that most people recognize the time commitment and financial commitments that go into running a place like this. So when members have 'expectations' or when they insult the administration, I tend to see that as feeling "entitled".
Anyone who insults my admins or moderators in a public post will last about 30 seconds, but that's just me.