Reply to MacBook Air for Digital Djing and Production?

I am just beginning to setup my gear for Djing and also wanna go for production in the near future. Why do I not see so many MacBook Air's out htere but a lot MacBook Pro's?
I do have a MacBook Air today but more for daily business e.g. I personally like the small size (11"), less weight but it seems I am missing some significant points.

I understand that a MacBook pro is naturally with more power and options for USB, Thunderbolt connection etc, but is that all about?

Thanks for your help!