The Attempts of a Peacemaker
Rather than argue about this why doesn't somebody try to contact Square and ask them about it? I can't see why Final Fantasy VIII needs to justify it's existence, and I don't think it needs justification from anyone else. There is nothing anybody can do to remove it from the Final Fantasy series, so why don't you accept that it is what it is - a part of the Final Fantasy series.
Square have made between 12-15 Final Fantasy games, and I'm sure they are not to everyone's taste. They've had to experiment with their games to see which ones were successful and which were not. If you personally do not like Final Fantasy VIII, then don't play it. If you do enjoy it, then happy gaming.