Lets start this of with a FACT; spell batching is indeed 100% part of modern WoW and every other online video game.
Every class in Classic 2019 has a pile of new and old bugs, mages are no different. Heck mags likely have the least amount of bugs.
Improved kick. (combat talent)
Actually authentic, I have seem hunters block and die off aim shot crits.
From my point of view the mage did not block in time the aim shot hit and he died,
From his point of view he blocked and the aim shot hit… He still died.
I remember a little bit of this kind of behavior in vanilla, but it was very rare back then… Early vanilla actually, I think they had most of these kinds of things actually fixed by the end…