I think the poster's point is that FPV drones & accurate/advanced shells mean that you get all the downsides of WW1 trenches and no-man's land, PLUS new downsides of trenches not helping so you're constantly under threat of death no matter where you are. Plus: the more people huddle together the better the target they are, so you get to hide in small groups (or solo) in the hopes that the economics of killing just you doesn't pencil out and the drones will kill someone else while _they're_ sleeping, instead of you.
If you're looking for more reading maybe start with WW1 trenches, then look for YouTube videos about Ukraine drone usage? The drone stuff may be too new for lots of writing about it, but you'll get an oblique view of it by looking at how the Russians put those roll cages / turtle shells over their tanks, etc.
If you find anything and wanted to share it that would be interesting (if morbid)!
Technically, they'd be sleeping in a dugout where the entrance is covered by tarps and has ideally at least 2 turns to avoid the blast traveling inside (and potentially to make non-fiber-optic drones lose signal as they try to maneuver inside in case they get past the tarps).
You're most likely to get droned when on watch or carrying supplies.