I don't remember exactly how it worked, but I do remember main gun crits used to save a tank from death i think?
Like a 160hp or less tank could survive a full shot just because of a dice roll. Basically the current abandon mechanic except you still had full control/speed
I'm fairly certain it had a chance at any time but it was almost guaranteed at death. I have memories of fresh tanks losing their guns on the first hit. Could be misremembering though, it's been a long time and I'm not as young as I once was...
At any rate I feel limited reintroduction of the temp cross could be nice