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Wayland has no drawing APIs. Instead, a Wayland client gets a DRM buffer handle, which is practically just a pointer to a graphics memory. Practically Wayland does not care how the client draws to that buffer, it only copies the client's buffers on the screen. The removes a lot of complexity (because Wayland just pushes the complex stuff to the other layers of the stack) and by making the clients responsible for all the rendering, they can be smarter on how they do things like double-buffering for example. See More
Most closed sourced drivers do not support the KMS/shared-GEM/shared-DRM technologies on which Wayland works. While this may be okay for open source purists, who only want to use graphic cards that have open source drivers available, it may not sit well with people who spend a lot of money for high-end graphic cards only to get some crappy 3D performance. Although it should be noted that NVIDIA has declared that they will start supporting Wayland, it may take years before Wayland fully supports most high-end drivers. See More
XWayland is necessary to support the vast majority of GUIs that don't yet fully support Wayland (e.g. Firefox). Popup windows and context menus in XWayland behave badly, flickering, opening in strange sizes, and refusing to reopen within the same session. Seems to be best documented here and here. See More
Since Mir is being developed by Canonical to fit the need of the Unity DE and Ubuntu, on many different devices, from desktops to laptops to mobile devices and tablets. Because of this, Mir is great for Unity, in many different ways (security, efficiency, functionality, etc.). See More
Mir isn't bad. It just doesn't fit in the world outside Ubuntu products like Wayland does. Instead of Canonical choosing to use Wayland as their next generation display server they choose to go their own way, which does not contribute back to the community in any meaningful way, in that area. See More
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