After FOSDEM I've tried to get Nemo running in a VM to check how modRana and Universal Components look running on it. I've been able to get some sort or GUI running in the VM but even the help of the main Nemo developers via IRC we have not been able to make it register mouse input...

I haven tried since and the situation might have improved since then, but lets imagine that Nemo had all the closed source Sailfish OS (minus the theme and without the Sailfish/Silica/Jolla branding) and could actually use their limited resources to improve it and fix existing issues, thus improving both.

Not having to fight such basic issues such as registering mouse/touch input while having to develop sour own widget set, email application, messaging UI, homescreen, PIM, etc...