It kind of sucks being a new player

[Shai]

When an MMO expansion comes out, and someone buys that expansion, the general hope is to be able to play the expansion and not content that has been irrelevant for over a year.

MMOs are social games; part of the fun is to experience things with people. You lose something when you're constantly playing catch up. It's like finally getting around to watching a movie years after it was popular. No one cares that you just saw Catch Me If You Can for the first time. No one wants to talk about it. You missed the boat.

You don't buy The Burning Crusade to farm Scholomance for a month.

None of that content is irrelevant and nothing is stopping them from farming Law Tomes and doing Alexander.
The only thing that's irrelevant at the moment is Coil and Crystal Tower. High Level dungeons are still being run daily for exp and relic upgrades.