I saw lots of "discussion" as to whether or not a broken piece of equipment affecteded mission readiness and that end of that discussion was usually determined by the Captain's call on whether or not to release the CASREP. The fact that there was discussion was surprising to Aviators. Our MESM says, "if X is broken then you're partial or non mission capable" in black and white. MESM is promulgated by the TYCOM. Even with better up vs down guidance there are still plenty of ways to fudge the numbers on the aviation side but the system seems, to me at least, to be more transpatand rigorous.
I don’t disagree. Ships are left to figure out the impact of a particular broken piece of gear on a mission area on their own.
It’s usually still pretty clear (broken air radar = no AAW), but where it gets tricky is when you get to degradation of equipment rather than something being completely down.