Hi Designer Cow.
It's not "impossible," to revert to 10.7.....many of us have done so, with varying "hitches," like losing playlists etc, which happened to me.
That's not too much of an issue, as I change them almost weekly..but it can be done, and relatively painlessly with a few simple steps which, if you trawl through the earlier part of this discussion, will be made clear in a few basic steps.
My only and continuing gripe, is that I'm still getting reminders to "upgrade," to 11.01.......
It's NEVER going to happen, till they provide a solution to this problem.
😉
I'm wondering how many people have "contacted," Apple with their grievances over this.
I have, on a number of occasions, though I'm not holding my breath that it's done any good..