I love how Desire Will Rot follows a similar pattern as Black Flags, My War did, with the super chaotic and energetic grind start to the album, and then the last 3 songs slow the pace down and take on more of a sludge approach. One of the best releases of 2015 by far, which is really saying something considering last years plethora of quality albums.
To be fair, I actually think there really is an amount of stylistic elements in FTF's mix of subgenres, you'll find in "Deathcore" crap, too. This can be heard especially during some moments of " Die Miserable ", for example.
Of course, FTF's approach to this parts isn't a genereic one, but I can hear where the idea, this may have something in common with Deathcore, comes from.
Havin' said that, Fuck The Fatcs is one of the very best Extreme Metal bands these days, while most Deathcore is childish shit.