There are several legitimate reasons been given, but you lot keep sticking your fingers in your ears and go lalalalalalalalala i'm not listening.
It is needed for switching between a PvP and a PvE spec.
I've asked this in the other threads, all the people against how many of you do regular PvP?
Out of all the replies I've had only 1 has replied yes and he/she used a halfway gimped build to do both.
OP your idea, anything that grants bonuses for time spent is grossly unfair and shouldn't be considered at all.