It’s good to see the minimal drag to border behavior coming to all the OSs and DEs these days. I’m a weirdo and use i3 so I relate to this concern and am very comfortable with tiling for lots of applications. However there’s sometimes I wish I could just tell my display manager to treat the single WH wide monitor as two separate displays with dimensions, e.g. W(H-x) and W*(H+x).

Not sure the best level to implement this. There’s probably already solutions for this now that I think about it…

Stilch does that. niri#3159 requests that. Both in my comment above. :)