> For instance, Mir is under GPL with a CLA so that only Canonical has the ability to sell a proprietary license to vendors who are GPL averse. Do you think this doesn't matter for other commercial distributions? Let's be realistic here.
Those are all valid reasons to not use Mir.
For something like KDE that I believe supports Windows, these are not valid reasons for not supporting it.
At this point, it's not worth going back in the archives to dig up quotes from prominent KDE devs saying that had no intention of supporting running on Mir, but I'm sure many people remember reading such statements.