I guess my definition of IMC must follow the legal definition of "that which is not VMC", though I must say that what I have in mind is flying in cloud, not doing 141kts at 2000' with a 2400' cloudbase
It is alarming to hear all the emotive arguments about it being unsafe when it seems to be the safest way to operate, at least actuarily.
But, as I say, there are other places to engage in that debate, I am just trying to get the history straight.
I had forgotten about the Aztec wing tip, though I do now recall it. I guess that that was the closest we are going to get to an en-route IMC collision involving a civilian aircraft outside CAS. Are we sure it was in IMC?