This material is work-in-progress ...
Do not follow instructions here until this notice is removed.
The goal of this is to remove the S currently needed for shadow logins.
It would be nice to see the elimination of these file permissions from Alpine. The reason for this is because throughout the years SUIDs/SGIDs have repeatedly been a source of exploits (esp. privilege escelation) for UNIX derivatives. It may be unfeasible or not unwise to completely ban these file permissions for all packages of Alpine but removing these permissions from Alpine base and X server has been proven to be doable and would provide safer Alpine systems out of the box.