Class roles in raids

So I had a thought while milking this morning that worries me. They sed in the interview there will be a lot of specific situations were u will need certain members of the raid to do specific things. Well that took me back to my days wow were as a lock I would be brought in for the same boss fights every time then booted for other fights were a lock was not as good. I really dont want to see anything like that happening in Destiny raids. I dont like to see cookie cutter builds or raid combos. What are your guys thoughts