IMO: People are just misunderstanding the multiple purpose of the video tutorials. Watching a video helps you to know the mechanics involved in the battle. It doesn't make you win, it makes things easier to understand and learn. You can manage the strat with your party as you please, but you know what's going to happen when the boss reaches, for example, 50% of his HP or what X mechanic does if you do Y or Z. If there's a party asking for people to watch a video first and you don't want to, then don't join them.

I DID watch a lot of video tutorials for T9. I also watched win videos, practice videos, I read about their mechanics and strats. Sadly, my static doesn't have much time for practice, and having people that knows the whole thing or its mechanics help with the whole process. I encourage my group to watch a video. It's not mandatory but it's really useful.