The CEO would've found it very easy to remove the blocker in that case (me). This is the life of small tech businesses. Also, they were modifying configuration files (php-fpm configurations iirc) and not code.

FIM is very useful for catching things like folks mucking about with users/groups because you typically watch things like /etc/shadow and /etc/passwd, or new directories created under /home, or contents of /var/spool/mail to find out if you're suddenly spamming everyone.