For me is the lack of virtual displays is Wayland.
I'm using a 49" monitor (with i3) and split it into virtual monitors/displays. For some tasks two displays are good, for others three, and all doesn't need to be the same size.
The reason for not using i3 splits is that many programs have fullscreen functions that I often use.
Watching a movie is one example, where I have a script that automatically calculate the optimal width without borders and gives me an extra virtual display beside with whatever's left.