Which DE is compatible with i3 and looks sharp with HiDPI scaling?

[fbodymechanic]

You are a very prime example for someone that might be interested in giving my tutorial a try. Give it a go, you may find this to be the DE you’ve been waiting for. Post in the thread if you come across any questions!

[Tutorial] Easy Setup: Endeavour XFCE + i3 tiling window manager

There it is. And then you can hold meta+click with the mouse to move it, and at that point you can grab a corner to resize anything as you see necessary. meta+f will toggle fullscreen on anything as well. All of these are customizable to your preferences as well. Just edit the i3 config for whatever works for you. I immediately switch my kill window to meta+shift+x - I have used it for years now. I even use it as a shortcut in Plasma and basically every install I do.

My next suggestion would be KDE + THE khronkite script for window tiling.