Yeah, it’s not a solution, but I think people upvote those kinds of comments because they’re just relieved or confirming that someone else is having the same problem. It’s less about an "answer" and more about "yep, same here." Not always super helpful, but pretty common in forums & message boards.
As for people testing and not reporting back... your emotional disposition is totally fair to want that but not everyone thinks to circle back after their issue is fixed... lives are busy, obligations can be random, some people are just not about helping the community or they might try something and just move on. Doesn’t mean the advice didn’t help, just that a lot of folks read and bounce unfortunately. Its the internet.
As for repeated comments & questions... that’s always going to happen in bigger threads. Some people find the post via a google search or jump to the end without reading through the original post since that would require reading 30+ individual comments. A little annoying I know but... kind of just how the cookie crumbles in community post.
As for the possible fixes... honestly, big thanks for sharing it. Even if it feels like no one’s listening to the previous post, odds are good that someone quietly tried it and it worked for them. You might not always get a “thanks” but the help still matters. Those who work in helpdesk know what I mean. I’d just say yeah, the noise can be annoying, but don’t let it take away from the fact that you or anyone else posted something that was helpful to even 1 user. No need to be so aggressive about it but thanks for your reply anyway @fittleworth-UK