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Why don't more distros use this method?
(www.virtualizationhowto.com)
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Maintenance. Your distro has to support all the provided desktops, which includes a multitude of display managers ("login mask") doing their own opiniated session thing.
For example, Gnome is no longer supported by Artix, because they have now a hard requirement on Systemd.
It seems very unlikely to me that these are all "fully supported". Probably just 1 or 2 and then the rest are just like "yeah I mean you can try them", but I can't find any further info on their site.
But then they are not supported (shipped with them).
Being shipped with the distro is not the same as being fully supported.