Let’s refrain from making assumptions like the above. It really undermines your argument.
How is this any different from the way legendaries drop?
Your calculations are based on an assumption…And for argument’s sake, even assuming that this is true, you have the item transmutor thing now, which should make completing a set significantly easier. Furthermore, if you enjoy playing a game with significant diversity in itemization, you’re just going to need to accept the role RNG plays in it.
There is something kinda similar out there, and it’s called GDstash.
Closing thoughts:
I hope I didn’t come across as rude, because it’s not my intent to trivialise your opinion. While you are more than welcome to raise suggestions, at the end of the day, it all boils down to the decision of Crate. For what it’s worth, it is far easier to farm items in GD than most people realise.