Seems like they use some kind of massive sampler and just press preset buttons.
Believe me there is much more to it then just
"pushing a button" after all playing an arranger kb if you think about it the
"keys" or how you say
"buttons" you have to press to make music also,.....there is certainly a talent in both methods for sure,...and then there's the performance & audience control experience especially with a large crowd as shown,.....new technology evokes new talents and it will continue year after year....as the original post title states,..
"Like it or Not This is Where it's Headed"Thanx for your thoughts...