I voted number 5 because that seems the most sensible reason.
Me personally I don't care why they did it provided two things
1)Doesn't overtly effect game play
2)They don't lie about why
I'm big on honesty or rather low on Lying, can't stand liars and lying. I fine with being told to my face because we decided it that way and that is the way it will be. No problem with that at all (provided the tone is correct) but when you play foot around the why with ridiculous excuses even if valid it is just insulting. It says we can't treat you like an advlt when they do things like that or more accurately treating you like an advlt will cost us money (see youtube latest lie about rules being unanimous).
Now I am not throwing an accusation toward Bethesda with that last paragraph but merely stating my opinion but I hope Bethesda treats us like advlts and doesn't lie to our faces like other companies do.
Capcom: It isn't a left4dead clone
Youtube: The rules are unanimous
ect.