You can paint a picture by assembling hundreds of thousands of tiny dots of each color. You can paint a picture by throwing paint at the canvas, or dripping it from a great height. You don't HAVE to use a brush and classical technique.
What's important is the picture, not the tool made to create it.
Daft Punk hire musicians like Niles Rodgers or singers like Pherrel to PLAY on the records. They don't just lift loops from records. George Martin used tape loops and found sounds on some of the Beatles tunes, and played on some of the tracks, as well. Was he a producer, or a musician, or a loop manipulator? He was ALL of that, just like these guys.
Don't pile on these guys just because they are young. They aren't doing anything our generation didn't do (except maybe make more money with it!)...
All ANY producer does is 'assemble' music. Only the way they do it changes. The day after Les Paul made the first multitrack recordings, music was no longer 'arranged' and 'recorded'. It was 'assembled'. Let's keep some perspective, here. LOL
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An arranger is just a tool. What matters is what you build with it..!