I admit I did not read all 25 pages. I read the first 12-15, and then skipped to the last 2 or 3. I have a few things to say on the issue:
1. Yes, some people troubleshooting on their end could fix their issues, whether it is the majority or not is simply a guess, and anyone who says otherwise is making assumptions with absolutely zero evidence to back it up.
2. Asking people to troubleshoot on their end is in general, unrealistic. When I worked on networks (I know, everyone is an expert on the internet, I'm not claiming that) it was mostly in the military. I literally, absolutely no joke, had on more than one occasion someone tell me their computer (in this case on an aircraft) wasn't working. When I showed them that the on off switch was in the off position, their answer, "I thought that was the official position." Yes, this is a joke in the military, but it started because yes, it happens. Think about how many people you probably still know (assuming we are talking about adults) who can't even use a keyboard shortcut, let alone troubleshoot a video card issue. This is why game developers have to try and find solutions to issues that in a perfect world, would be on the end user to fix, otherwise those people with little to no tech knowledge won't play their games.
3. Assuming someone's ISP will work with them is making a very big assumption, especially when you consider the previous point, and the fact that the first tier or two of techs you reach know very little more than the people mentioned in the previous point. My own ISP tech support didn't even know what I was talking about when I asked about 2.4Ghz and 5Ghz band support on their routers.
4. This is obviously a problem for a lot of players, based on the number of posts about it. Even [I]if[I] SE has absolutely no problems on their end that are leading to it, if they want to keep their players, they need to do something about it, even if that starts with a simple section on the forum for people to post comp specs, trace routes, etc, and then goes from there.
That is of course all just my opinion.