Again, this is what I've heard; never used it myself (mostly because of the issues you mentioned; I'm unwilling to give up copy-paste and hidpi). With that said, X11 is quite arcane. I3 is still good, or at least for me. Not going to try to proselytize here. I mostly switched because I had to use a completely ancient computer for a while, and I needed to use a tiling wm to get decent responsiveness.