I have taken some of the posts people have reported to this particular thread, and have plugged them into Google such as:
"macOS Mojave won't install"
Mojave install fails, etc.
What I still find hard to believe based on what people are saying here and what web results are showing, there are still more widespread results showing up regarding High Sierra, and even Sierra.
There are a few results regarding Mojave, but they are usually articles that provide problems and fixes. Not so much complaints regarding issues.
I think the one thing that still sticks in my mind is: While there are genuine issues from people here on this thread, if Mojave upgrades were as bad as people are saying, why aren't there more widespread results popping up on searches.
In fact, any other results that do show up say, other people reporting issues, have either come directly from people here, or people that people here have talked too.
This brings me back to my initial comment, does Apple not know how to fix it, or have they not considered it big enough yet in the broad spectrum of users and installs to bother yet? Usually if it's something big, Apple is pretty quick. I still haven't heard anything beyond this thread, and people associated with MacAdmins which is private.