"Professional level" implies high barriers to entry. I thought the OP was about what's happening at the entry level.
EDM does have exceptionally low barriers to entry--lower than pop (which typically requires singing), or rock or jazz (which require owning and playing an instrument, the former at a relatively high level just to participate).
I apologize in that case. You're right in that Zau was specifically referring to beginners without any ear training.
I still don't really agree though. If we're talking about a beginner level then you can teach a guitar player a power chord and a drummer a basic 4/4 rock beat with the bassist playing the root and they can make music that sounds decent. In pop you can teach someone to play 4 chords of a piano and sing over it and they will sound decent.
Whereas in EDM you can have all those going on at the same time and still have music that sounds like garbage.
Not only that but the instrumentations in rock or pop are often pretty established. You have a bass, guitar, piano, vocalist, and drums.
Now in EDM you have square waves, saw waves, sine waves, triangle waves, plucks, strings, guitars, piano, bass, claps, reverse crashes, ambience, special FX, wobble basses, growl basses, and the list goes on...
I can't speak much for jazz because it isn't my forte (Although I love the time signatures & harmony) but EDM takes a lot more work at a beginner level to not sound like garbage.
I also forgot to mention that DAW's, samples, and plugins need to be purchased the same way as instruments. I can buy Logic Pro X for the same price that I can a beginner guitar, or a bass. (Leaving piano's out of this cause those things are expensive af.)