Here is another (at times) similar sounding artist who also field records and works without grids, possibly even more free-wheeling than an editor like Burial - but in a more experimental genre I guess - I really doubt you can call it drum & bass but that's what they apparently do:
FIS
"I don't actually know the tempo of my tunes," admits Peryman. "I don't make stuff to the grid [of a software program]. There's not a metronome going or anything. It's just sound put down, and it sounds right." Later, he expands on the point: "The rhythm is starting outside the computer, and I take it into the electronic context, and I move in a direction with that, with what that allows. But it starts outside."
https://www.residentadvisor.net/features/1580
https://www.youtube.com/watch?v=ShBthteQr6c
https://www.youtube.com/watch?v=Hiq1yovL4ak
(
https://www.youtube.com/watch?v=R3DvhM9DMWo)
https://www.youtube.com/watch?v=wgB02p9uZGg
I think Balam Acab could also share some characteristics at times, can be dark and creepy and the pitch can wander sometimes although only the smallest rubato.. IMO he can be good, with some original style of his own, but certainly not profoundly introverted like Burial. More garage reminiscent like I guess Owsey and the likes. Maybe that's more glow-fi / chillstep or something... speaking of which, all of that shares a lot with Burial's rhythms among other things, but can often be a bit overly sweet or cheesy. Then again Burial cranked out some epic cheese with Rival Dealer lol, but that was just masterfully done.
If you want a glow-fi / chillstep sort of recommendation you should listen to
this track and most (earlier) work by Klātu. Lots of pseudo-asian sounds that remind of esoteric meditation CDs, can be relaxing but hey thats chillstep for ya.
There's also guys like Volor Flex / Trampique who seem to have copied Burial's general style, but although the music is not *that* bad it is clear that Burial's spirit cannot really be copied, just his tricks.
As for Burial himself, yes his artist album and Untrue (Etched Headplate is miles deep - i loved that tracked to a freediving video!) i liked very much but I really fell in love with his interpretation / collab feat massive attack's Paradise Circus. Is actually a very long track with at least 3 partial songs in there - he did similar things on the Rival Dealers EP which i also hold in high regard..
I also liked that album by Forest Swords, that guy makes pretty lo-fi music which isn't surprising cause he's nearly deaf! very interesting.
https://www.youtube.com/watch?v=YWGCEDYJAZ4
Andy Stott also worth a listen,
https://youtu.be/DvPUaMHUzgk?t=6m53s it's 'post-dubstep'.. which reminds me of Ben Frost who makes post-minimal music iirc. (Went to see him live in a very small intimate setting and those guys blow me away, it was such intense sound, just insane) Recent thing I heard one of my best friends listens to is post- black metal or something, all these post-modern genres, it's pretty funny :' )