Comment by saurik
How is Wayland more modular? It conflates the window manager, the compositor, and the display server, all into a single component that must be replaced as a single unit. This kind of new conflation is exactly what people dislike about systemd.
It's less monolithic in the sense that instead of one creaky unmaintainable ancient mass of software doing the actual rendering gruntwork there are now five (and counting) somewhat incompatible slick untested new masses of software doing it in slightly different ways that application developers have to worry about. It's kind of a pick your poison situation.