I had to explain the point of Finesse OS (used in the original NTI PIX firewalls[1]) to someone technical the other day, within the context of a single-purpose

I had to explain the point of Finesse OS (used in the original NTI PIX firewalls[1]) to someone technical the other day, within the context of a single-purpose (in fact single service) OS concept. “But it was Linux right?” Was a cognitive hurdle it took several attempts to clear. [1] https://en.wikipedia.org/wiki/Cisco_PIX https://en.wikipedia.org/wiki/Cisco_PIX