I just listened to some Fred Again tunes cos I didn't really know what he makes. I automatically hated him because he's posh, tall and popular and I thought I should hate him for more educated reasons.
Anyway from what I can gather he's really mining similar emo melancholy vibes as Burial did but in a more soppy sentimental (or warm and empathetic if you're not cynical about it) way.
The music is much blander than burial, too, and interestingly all his music has cover art depicting his friends, collaborators and self, and he incorporates a lot of vocal samples of friends and voice mails etc. (Compare burials facelessness, "darkness", etc.)
So although I'm not a fan (the one good one I've heard is the one that was in triangle of sadness that is his monster hit) I do think it's notable that he's so successful in part I'd suppose because he has this sort of comforting, hug ya pals type aesthetic going on. He seems to BARE his identity in a way that marks him out from burial and which is obviously a lot more palatable to a massive audience.