"give them a couple of hours to practice" != Spontaneously having to figure out a different workflow in front of thousands of people :D

(yes, she reacted suboptimally, just don't think it's fair to use here)

Grimes isn’t a DJ she’s a self-admitted meth user who diddles around with a lot of hardware most people can’t afford in the first place and the results appeal to a very minor market (as evidenced by being dropped by her label and no critically or market acclaimed releases in 10 years or so).

Grimes is a performance artist who dabbled in music. She’s not a musician. Imogen Heap is a musician.