Okay, I am posting to assure the OP that some people understand what he means.
I'm not so sure about that.

I wanted to give feedback from my particular perspective (the only one I'm qualified to give feedback on) that locking content behind other irrelevant content is bad. Basically making me do the previous raid in order to do the current raid when I don't need any gear from it.

For a WoW analogy, it'd be like forcing me to complete Mogu'shan Vaults before I'm allowed to step foot into Throne of Thunder. This is something neither Blizzard nor any other major developer does because it doesn't make any sense to do that and needlessly encumbers newer players.

But the consensus here, apart from a tiny handful of people who actually seemed to understand my posts, is that progression locks are fantastic. All hail the progression lock. And keeping newer players away from current content as long as possible is not only a good thing but a great thing.

So I guess both I and my perspective are wrong.

Btw I did complete T5 today with a new group who want to work on T9. Having completed T5, I STILL believe that progression locks are bad. But what do I know.