I really don't understand why this is even an issue, expecting people to watch a video of everything before they do it is silly, for some people it helps but from my experience you never really learn a fight, especially like titan, until you try it several times and gain experience. Watching videos is helpful, sure, but at the end of the day if somebody doesn't want to spoil content they've never done I don't blame them.

If you don't want to play with people who are inexperienced then make your own damn group and add experience to the party finder comment like everybody else, don't throw together a quick pug that includes inexperienced players and expect everybody to be on their A game because that isn't going to happen. Every difficult fight is always going to take experience to advance so you should really just train yourselves to have patience because I can guarantee you that will go a lot further than coming to the forums, trying to make up rules, and then whining when everybody doesn't follow the same opinion.