It let log4j pass for as long as it was known to be good. Within hours of the CVE opening the tool was blocking it. The purpose of dependency firewalls is to avoid two things: known badly vulnerable packages AND known malicious packages that serve no other purpose than to steal data or drop a trojan. No security is 100% bulletproof, but it's really surprising how much of the damage is done by 7 year old CVEs. Firewalls can be useful in exactly that.
This exact same sentiment came through in the National Cyber Security Strategy the US released. It describes a minimum acceptable level of software development, called safe harbours, based on e.g. the NIST Secure Development Standards.
Whether we like it or not, it seems legislation is forming on how to code and ship software.