I lootrun once every day or 2 and i do agree the amount of mythics that were obtainable from these chests were insanely high.
However, with the nerf it feels very unincentivized to get one from that route now.
Before the nerf i used to get around 1 mythic per ~200 chests, but after the nerf its been 1400 chests and i have yet to see a single mythic in a flying chest (I have 295% lb and 46% lq with 31% loot from charm of the stone) .
In contrast, ive seen 7 mythics from the end lootrun chest at an avg of ~500 pulls per mythic (i did reroll some so i didn't collect them all but i was offered it from them) only counting this week's lootruns. Although, most have been the corkian simulator and insulators, so i don't know if they are easier to obtain than the normal mythics.
Now (ignoring the possibility that I may be insanely unlucky on flying chests and really lucky in lr end chest) I think the flying mythic chest nerf should be toned down a bit, at least to the point where in 2 perfect lootruns you at least get 1 mythic (my perfect lootrun comprises of jester's, materialism, interest scheme, and hoarder where i open around ~450 chests at the end).
really owned em there