Comment 113 for bug 1559576

It has been used by default since 16.04 and is supported by all major open drivers including vbox/vmware, so its rather widespread.

Obviously having Xorg run as the user account instead of root is big win for avoiding security issues within Xorg. It wouldnt hurt to have some sort of description about the security risks in xserver-xorg-legacy.

Adding -legacy temporarily is probably ok, but get it off the images again before release.

rootless X is somewhat orthoganal to wayland support in respect to EGL Streams, but I would assume the KMS modesetting support required for Xorg must be there if wayland has got that far.