The original comment was that Red Hat could throw a lot of engineers at the desktop like they did OpenStack. Red Hat has already thrown a lot of engineers at NOME/KDE/X/etc for many years but to many it is never enough. Because the desktop they want is not the desktop we use. They want a desktop which is basically unified from the bottom up and is stable enough that other people can write apps and not worry about compiling 30 different versions for every variant distribution.
However the number that is required to make a basic desktop with a unified API, documentation, etc that Apple and Microsoft provide takes a LOT of manpower dedicated to doing just that. People working on it are not scratching their own itch, not allowed to rewrite API's because they realized they made a mistake 4 weeks ago, etc etc.