The reason we've avoided registering "Cinnamon" as a desktop name is that it opens up issues with many upstream apps that currently OnlyShowIn=Gnome or Gnome;Unity or just Unity. The relationship Mint has with Gnome and Ubuntu isn't genial enough that we could get them to add Cinnamon to their desktop files, so we would have to distribute and maintain separate duplicate .desktop files just for Cinnamon for these upstream packages.

please, for the love of god do NOT use Mint as a source of inspiration for a derivative distro. If you like Cinnamon or Mate, fine, but holy CHRIST do not let your infrastructure get as criminally sloppy as Mint's. No unholy mixing of Debian and Ubuntu debs into some kind of Frankenbuntu, no namespace collisions, no ... well, no being Mint in general, please!Ideally, I really, really hope you'll continue to support Ubuntu as a primary platform, regardless of what you do with Pop!_OS. But hooboy, do not turn into another Mint, please.

1) QT Apps load very slow in startup (ex, qpdfview, Audacious), had to look at Ubuntu forums to find a solution installing kvantum and KvYAru theme, so this is solved at the moment; but the theme (SVG based, cannot modify it in a text file) have orange highlights, not consistent with Mint-Y theme, but it is the best option at the moment. This temporary solution I found was here: https://itectec.com/ubuntu/ubuntu-qt-apps-are-very-slow-to-load-in-xubuntu-20-04-when-export-qt_qpa_platformthemegtk2-is-enabled/

We took a stance on an issue.

Restoring The Menu Panel on Linux Mint Cinnamon