Also very true, but I like to plan my classes carefully so that the perks I choose will benefit my primary and secondary.
'Cos I totally have a life
lol same dude, but like someone mentioned using lightweight (might have been you), but if you have say an assault rifle or light machine gun and you are camping, then lightweight does not benefit you
also if you are in a building that has close quarters or a close quarter area, then your shotguns will benefit the most, that is when you pull them out, when they will benefit you more then your primary
but i do like planning my perks and such for both weapons, just i am saying do not plan them solely based on your secondary