Distributors entering Flatpakland

pro: I'm running Ubuntu 20.04 but I really need the newest Gnome Evolution version. There's no joy for me with traditional Ubuntu 20.04 repositories (and I totally understand why). But I can install the latest Evolution 3.44.3 via flatpak and it works great. Packaging FTW!

pro: Emacs 2.28.1 snap allows me to have the latest Emacs very easily (I used to use a PPA but that was not always updated to the point releases etc.) At least with Emacs it's easy to build myself, but if I don't need to then so much the better. Packaging FTW!

con: Ubuntu used to use a snap for the Gnome Calculator app: it took like 3 seconds or more to start which was ridiculous; when you hit the calculator key on your keyboard you don't want to be waiting for multiple seconds for it to appear. Packaging fail! (this was changed back again since BTW)

con: Emacs flatpak is completely useless (for me) because you can't access binaries outside the flatpak except by going through contortions with flatpak-spawn: I invoke all sorts of applications from inside Emacs such as spell checkers, LSP daemons, terminals, ssh, etc. etc. Packaging fail! (the Emacs snap installs in "classic" mode which avoids these sandbox issues).

So, there are good places to use packages like flatpak and snap, and bad ones.