As discussed in previous threads, the cap won't be removed until there is a new Tome tier.
They are probably releasing that with the expansion.

It makes sense to
- remove Mythology tomes,
- downgrade Soldiery to garbage/tradeup status,
- downgrade Poetics to no weekly cap / 2000 softcap,
- introduce a New Tome with weekly cap

all at the same time.

Since the new Tome is not out yet, it makes sense that the cap wasn't removed yet.

You'll just have to spend your time in 2.55 farming WoD and FCoB to gear up.