The outcry about boosting is a Red Herring

I agree with you I don't see the big issue here as it let people play the way they want, I personally like leveling up my weapons in a normal match, but I am a terrible pilot so I would like to level up my helicopters and jets in portal so I could get the unlocks for those without having to take away from a team online where I would just crash or get shot down by someone better then me.

I have a lot of time to play after I get home from work, but I wouldn't mind letting those that don't have much time to game have a chance at catching up on attachments if they choose to do it through portal.

As you mentioned having unlocked everything doesn't make you better at the game and you can easily kill people with the default weapon/attachments if you know what you're doing.

I understand the part where it fill up their servers with bot farming lobbies is a problem, but why not let those that want to go through farming that way host locally and still level up their stuff if they choose to. That would solve the limited servers we can host online wouldn't it? And it would let those creative people host their custom modes online without worrying about bot farms filling up the server list.