It was that way in BL2 (more players and higher difficulty,higher chance to loot),I expected it to work that way,I did advanced and avd hc as soon and as much as I could and my gear page (and the pages of whom I have played with) would make you cry I guess. Be it the frequency or the rarity (maybe because of the frequency),we saw an increase.
Yeah,sometimes you do adv hc and end up with a rare at best and are outraged that a common loot pack can be here but eh,it’s random.
The problem is that people expect a drastic increase without really farming or applyng any patterns or statistic.
I’ve treated all this the same way as in other game,with probabilities and statistics. And it works for me and the people I play with.