This has happened many times over the decades. Osmosis (mostly!) results in the better changes trickling back into mainstream linux distributions.
My least/most favorite example of this is Stormix Linux.
It was based on Debian, back in 1999. It was geared towards a simplified desktop experience and introduced a lot of new things, at the time: graphical installer that detected hardware (and had a broad set of hardware support not found elsewhere); GUI apt manager; and a number of other really clean add ons that made the desktop more usable. It was head and shoulders above all other options at the time.
When Stormix the company failed, and the distro died, the resulting community/developer effort became the Progeny Debian distribution for a short while, and a Progeny package repository. I used that for years.
Arguably, if it wasn't for Stormix, Ubuntu wouldn't have become what it is today, as those efforts were later channeled into Ubuntu.
As with most things in life, it's 2 steps forward and one step back...