At the start of 8.3 we got a new Island Expedition vendor with "Salvage Crates" -- buying extra chances at a more focused RNG. I think this was received positively.

Now MOTHER the corruption vendor uses a different routine. Instead of extra chances at a more focused RNG, we have a twice-weekly rotation of items for sale.

I don't see why the latter is worse. Personally, I think it makes more sense.

But either way, if enough people clearly acknowledge the compare/contrast and explain their preference, then Blizzard can learn what the players want.

(Clearly whining that "I want a vendor that sells all the items all the time with zero RNG" is pointless. Blizzard is doing what pricing theory calls A/B testing. Fussing about a non-existant choice C is a waste of time.)