I did 80 Grigoire kills this morning and got nothing. Two other people in the group got Andariel’s Visage.
Certainly anecdotal, but 2 mythic drops in 320 combined chances certainly doesn’t seem great. They should put it back somewhere closer to last season IMO.
Also, where are the Lith runes? We can craft Tyrael’s now but the runes are even rarer than the item drops themselves. I have stacks of every legendary rune but only 1 Lith.