I know that PostmarketOS has a larger team behind it, but especially the last blogpost on the site you linked invoked that idea:

This quote is followed by ideas to do that and by a list of devices where boot or hardware activation bugs were fixed. They use an N900 and made "a few usability improvement patches" which, if you click on the link, consist of changed wallpapers, twice, a shell replacement and improvements for running i3wm, which is not general user friendly in any way.

From my perspective it seems they are stuck in the playground and lost focus for their goals. If I got that wrong I am happy to be corrected.

The progress in Maemo Leste seems way more tangible and I applaud the small development team for that.