PAM guru help to interpret system-auth password-auth RHEL 7

I have a RHEL 7.9 system which currently has identical system-auth and password-auth files located under /etc/pam.d/. That file is auth required pam_faillock.so preauth audit deny=3 even_deny_root fail_interval=900 unlock_time=900 auth sufficient pam_unix.so try_first_pass auth [default=die] pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=900 auth required pam_env.so auth required pam_faildelay.so delay=2000000 auth sufficient pam_unix.so try_first_pass auth requisite pam_succeed_if.so uid >= 1000 quiet_success auth required pam_deny.so account required pam_faillock.so account required pam_unix.so account sufficient pam_localuser.so account sufficient pam_succeed_if.so uid < 1000 quiet account required pam_permit.so #password requisite pam_pwquality.so local_users_only retry=3 minlen=12 gecoscheck maxrepeat=3 password requisite pam_pwquality.so local_users_only retry=3 gecoscheck maxrepeat=3 password required pam_pwhistory.so remember=5 use_authtok password sufficient pam_unix.so sha512 shadow use_authtok password required pam_deny.so session optional pam_keyinit.so revoke session required pam_limits.so -session optional pam_systemd.so session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid session required pam_unix.so - can someone explain in understandable English what all is really happening? - is there any bad or incorrect items? - is the minlen=12 and maxrepeat=3 of any purpose when they are defined in /etc/security/pwquality.conf { and /etc/login.defs for minlen } ?