This also means that you will never get an opportunity to troubleshoot a system you've been shut out of.
Like an old machine that you forgot the user password of.
Rescue isn't useful there I agree but there
Always has to be a way to get a grub prompt !!!!!!!
This must be the most user-unfriendly idea you have ever had. 
Might as well delete this too then:
https://forum.elivelinux.org/t/lost-password-in-centos
This locking out is about as bad as any Windows solution.