Which league mechanics benefit from T16 + irradiated tablet (lvl 82 locations)?

Are there league mechanics that benefit from T16 + irradiated tablet or doriyani (lvl 81 locations)?

I remember in 0.4 ritual could roll top tier omens only in 81 lvl areas, is it still the case? Do I need to run lvl 81 to have a chance of MB / HH to appear in rituals?

Also in 0.4 temple areas were giving more charges on T16, not sure if it is still the case.

I understand that it helps with XP and drop ilvl 81 bases, but are there any league mechanics where 81 area level is the must?

Edit: realized that T16 + 1 makes area lvl 81 not 82, fixed in the post, but cannot change title