Then why put the user in the sys group when its purpose (administer to printers via CUPS) is replicated in the wheel group? You would use the sys group to give a user without sudo privileges the right to administer to printers.
sys - Right to administer printers in CUPS.
wheel - Administration group, commonly used to give privileges to perform administrative actions. It has full read access to journal files and the right to administer printers in CUPS.
I doubt that thereās any real need for the rfkill group. The private (self-named) group and wheel should be all that is needed unless the user has a specific need for other groups. Hell, I donāt even use the wheel group - that just means I have to use the sudo command for a few tasks that wheel users donāt need sudo for (for example, sudo journalctl vs journalctl to view all system journal).
Actually, the discussion is a little off (topic?) and not exactly clear.
Setting which groups are added by the installer to the basic user (administrator) is different from what groups are required from a non-superuser added after installation by the local admin.
The first/basic/admin user, being in the wheel group, has all required privilege for a normal user needs.
In a real (corporate?) multi-user system, each user would have restricted group membership according to their needs.
In a home/desktop multi-user system, it may be desired each user has wheel group membership, while it could even be just another account for the main user (to use for different DE, or testing). If a realother user is not technically trusted, having wheel group, may lead to destroying the system
Thatās why Calamares may be set to give minimal groups (including just wheel?), while local admin has to find out what/how they want the system to function as multi-user. A utility designed for this purpose would be the best user-friendly/OOTB approach, but still, the admin has to know/learn āwhat is this thing called permissions or groupsā
The advantage of including the sys group by default is that if someone wants to remove wheel which some people do, they can still manage their printers.