clean it up yourself if you love it so much
Are we 12?
You're telling me a project that has taken 15 years and is just now getting decent nvidia support and which may someday allow applications to position their own windows is rousing success? Compared to a rework of an existing codebase? That has all the signs of a "we bit off more than we could chew".
It'll work, in the end. But 15 years of work on a migration from X11->"X12" or something would have likely been easier. Especially if they didn't ignore nvidia along the way.