Not sure why you would say that, Sebastian, since basically all it does is restrict some members of the Administrators group from editing most of the pages on a site... specifically, those also in the User Managers group. It is those administrators who don't want to be involved with full site administration, but focus only on adding and removing users. It lets them do that and hides other site editing and management functions from their view.
The solution you mentioned may become a good solution one day, but as of now it seems to have a number of serious unresolved issues.
Object reference not set to an instance of an object.
#39 opened 5 days ago by dstarr1213
not suitable for sites with larger user base
#38 opened on Dec 9 2015 by sleupold
Error after adding, deleting and restoring a user
#37 opened on Nov 6 2015 by tdgarvey
Hard Delete Results in Critical Error
#36 opened on Aug 14 2015 by vnomus
I needed something that I knew would work right away using standard software and would not involve any third-party modules. This solution delivers on those requirements. I support your work and will consider upgrading to it when I feel it is stable, but for now, I have a solid, stable solution.