I don't really care for GNOME Shell but it's nice if those people use GNObuntu instead of Fedora, so we all may have the same, stable base at some point (Ubuntu) and fragmentation is no longer an issue.
Yes. It's definetly nice that they use distribution that does very little upstream developement and ships with heavily patched libaries.
You're arguing 2 sides of the coin there. Afaik Ubuntu make changes to Gnome, which aren't accepted upstream. it's not a lack of willingness to commit upstream, but the fact that upstream don't want the changes Ubuntu has made which is why stuff isn't accepted upstream and the Ubuntu libraries are different.
I'm running Arch atm, but found that to get touchscreen working as expected I was installing the Ubuntu patched gtk libraries through aur. having these patched libraries is actually very useful, I just wish the patches could find their way into vanilla gnome.