As an European frequenting both concerts and festivals I really have to disagree. First of all al lot of these acts barely perform on solo concerts, and if they do, getting tickets tends to be difficult. This may be more true for us Europeans (where American music reaches our shores more easily than the other way around.. really, shame on you USA for not knowing Blur).
Secondly, when you want to see a lot of bands, festivals tend to be cheaper than to buy tickets for each act you really want to see. Plus you get a bonus.
But most importantly, the entire festival mindset is one of the best feelings in the world. Goint to a concert, its just an event.. you go there, you watch it, you go back. Festivals are multiple days of living in another world. The experience of being at one is impossible to capture with a livestream.
Anyway, Coachella seems like an awesome festival and Id visit if it wasnt so far from The Netherlands. Though, as an European, I really don't understand why you need a dedicated bar area.