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The criticism is that Wayland duplicates a lot of effort in multiple compositors. The compositor does work that happens in Xorg and in the WM. Whereas lots of common functionality gets implemented in Xorg that WMs and DEs don't need to duplicate.

It's not a weird complaint when on X11 when something is added it generally works for everyone whereas for Wayland the different implementators are still squabbling how to accomplish basic functionality people expect from their desktop computer.

Or in other words, your comparison is like saying food and shit are basically the same thing because both are made up of similar elements.

But wayland merges more components into one server than X11 did. Therefore, there is a need for more wayland server then there was a need for X11 servers.