First of all, don't try to say that all you're doing is "answering the op's question" when you are, in fact, not. Also, yes, you are being difficult. It is my honest opinion that your needs in a computer are a bit arbitrary and irrational. Secondly, none of your needs cannot be satisfied with the air. External display - yes. External hard drive - yes. Keyboard + mouse with BT - yes. You haven't mentioned ANYTHING about lack of power, probably the main concern with using the MBA as a primary machine, so basically all of your arguments against using the MBA as a primary machine are unfounded. That is, besides your irrational preferences for supercilious things. "Just my opinion."
i think i know why i dont want a mba as a primary machine so no they are not unfounded and hardly irrational
the op said " i dont see why a mba cant be a primary computer"
my reasons are reasons enough for me and many others
but as i said if it works for him, more power to him. but dont expect to post that statement and have everybody agree. you follow? lol