It has a definitive message.
These theories are nonsense. I can tolerate R=U because it's interesting but Squall is Dead just bugs me.
EVERYTHING GETS WEIRD AFTER DISK 1 SO IT'S ALL A FANTASY!
Except it doesn't. Mostly everything after Disk 1 has its origins in Disk 1. NORG, Seifer's romantic dream, Adel, the Laguna flashbacks - all these things are based on stuff we get in Disk 1.
The only thing that comes out of left field and is totally unnecessary is a time traveling Sorceress FROM DA FUTURE.
I will not attempt to cover up the game's clumsy writing under pretentiousness.
Really when you think about it, these attempts to explain away stuff are just insulting the game more and marginalizing what it did right. I like FFVIII more or less while also recognizing how very flawed it is. To be a true fan is to understand precisely how and why what you love sucks.