I have to say I’m not a huge fan of Blizzard artificially trying to milk subs by gatekeeping content that wasn’t originally meant to be locked.
Right now there is about 3-4 hours worth of raid content per week, and sharing 3 tier pieces between 25 people gets disappointing and annoying pretty fast.
Sure you can farm heroics for that one elusive epic from the last boss, or stock up on badges for future patches, but that just means you won’t be doing those heroics for badges later, so its more like borrowed content from the future.
Sure, hardcore guilds will probably kill Vashj and Kael on the day of release, but I’d wager that more casual guilds will struggle with them and it will probably take weeks for some.
I didn’t really raid much in original TBC, but I remember a friend of mine who was in a pretty serious guild, and they raided BT for weeks or months before finally downing Illidan.
Kara and Gruul are still going to be cleared every week for the rest of the expansion, so I dont really see the point of artificially locking content away (apart from the cash flow ofc).
And even if you are a very casual player and feel like you dont want to be “left behind”, you’re not really losing anything if more invested players have some better gear that they will end up having anyway later. In fact it probably makes your life easier.