https://fedoraproject.org/wiki/Fedora_35_Final_Release_Criteria#Default_application_functionality

"Basic functionality means that the app must at least be broadly
capable of its most basic expected operations, and that it must not
crash without user intervention or with only basic user intervention."

a. I take "basic functionality" as a compound noun, equivalent to
"fundamental purpose".
b. If the package manager has a reproducible crash, it's a blocker.
I'm having difficulty parsing the double negative above. Does it means
"it may crash with non-basic user intervention"?

I have no idea how to
categorize basic and non-basic interventions.

Insofar as this applies to GNOME Software and KDE Discover, anything a
GUI application lets a user do, is in the course of achieving its
fundamental purpose. I'd say any bug that is not a cosmetic bug is a
release blocking bug for these components, when the problem is
experienced on a release blocking desktops.