I was pretty sure BLP shouldn't be affected by crated legendaries but here I am, around 50 mythic and heroic dungeon bosses killed, 2x full LFR NH runs and 3 emissary cashes later and still no legendary.
In my other alts with no legendary I got my first one after like 1-5 dungeons max.
This is all after 7.1.5 btw.
So, what's the dilly!?