"Mythos found 1000 zero days in a few weeks - if I had asked your thoughts on this a few years ago, I'm sure it would've been "that is a super-weapon"."
No, my take would have been that a very strong new move had been made in a long-standing, classical arms race.
Since I rather like stable equilibria in areas like this, my thoughts would have been that white hats need to catch up immediately to reestablish the stalemate ... which was probably the course we were on, prior to today.