There are some very important uses of such institutional eavesdropping, such as running an intrusion detection system on a corporate network; I'd argue that this is a worthy tradeoff between employee privacy and good information security.
You've undermined both if your proxy is powered by Komodia or another product with similar flaws. What if you've hardened your workstations, but your proxy client supports inferior ciphers? All that work is undone. What if your proxy is easily fingerprinted? That's valuable information to an attacker. There are so many details to get right, and it can take years to discover the flaws that can be exploited by an attacker poking in the right places.
