I can see plenty of reasons not to like festivals (sound quality, crowd, overpriced food/drinks etc) but tbh I don't see why you'd care about the lineup ? A 1-day ticket for Rock en Seine is cheaper than the tickets for the Berlin show lol.
Anyway, according to their Instagram account they will announce some artists names tomorrow at 6pm (GMT+1)
They still sell 1 day tickets for festivals? A lot aren't doing this anymore. My first Aphex gig was 2009 Melt! in Germany, 1 day ticket back then, now they only sell for the whole weekend. I may think about it, but I'm curious if he's playing more Europe shows. If he gets announced eg for Bangface or something like that it would be way more appealing.