I think I would be the biggest evangelist for Zotero if it didn't dump everything into a single library
If I could have several completely distinct Zotero library files that I could open, close, email, delete, etc instead of the current "put it all in a bucket and hope" plus "silently failing sync" hell
I would use it myself and force everyone else to
Alas, .bib file and ebib in Emacs it is