I know, for I started it.
I’ve been testing Unity session on 19.04, practically before everyone else. Tried Caja, but moved back to Nemo. I run Nemo 4.06 in Ubuntu-Budgie, in the default Ubuntu, in Ubuntu-Unity and in Openbox.
All 4 distros in separate partitions are kept updated everyday. Unity broke a little, but picked up, after your unity daemon and settings update. Best of all strangely, is the Openbox install, for no upgrade breaks it or any app installed in it. The default Ubuntu, also keeps up very well. Only it doesn’t have Nautilus at all.
I don’t remember today, how I got rid of Nautilus from the default Ubuntu installation, but somehow I did.
In the Unity installation, I have got rid of Nautilus too, but can’t get rid of nautilus-data, which is gone from the default Ubuntu installation.
If I try to uninstall nautilus-data here, it’d uninstall unity, unity greeter, unity control center, etc.
Nautilus can be purged. I somehow did, only can’t remember how today. Most unique situation is with the default Ubuntu, where neither nautilus nor nautilus-data are present, and it is working.
So, there maybe a way to separate Unity from its baggage of dependencies, even if the parts of Unity DE cannot be separated.