Server faction imbalances dont prohibit you from raiding or doing dungeons. They can however impede your ability to pvp regularly or with the same consistency as someone who does pve. Thats a problem.
CRBGs were implemented to deal with a very specific issue and since LFD doesnt share the same burden or problems it doesnt get to hitch its wagon to CRBGs as entry into Wrath.
Its apples and oranges.
Clearly Im not the one confused. My track record is alot better too.