There is no reason to load the game up and kill enemies once you quickly obtain everything they have to offer.
I never experienced the rapid drop rates like you and others did, but then if you got them that early I doubt you took the time to give the game a second chance. I have spent quite a healthy amount of time grinding in Mt. Bloom, just like all the other areas in the game. It was probably just a placebo.
Except in the final release, most people are not going to linger around Tai Ming to get absolutely everything.
I don't know how you play, but I most certainly will. Even if I'm not 100%ing the game, I'll still sit around and grind for the next set of gear upgrades and level ups to prepare me for the next area. I guess when one play's the measly, underpowered 1H then it's kinda necessary on hard mode.
And when I am 100%ing the game, I only have a limited tolerance. I haven't 100%ed the current patch on either of my eligible characters because I got bored of the game with one of them, and the other got very tedious grinding for an Autumn Knight's sword. I don't particularly want to bore myself again in Tai Ming.
By doing this we're also not giving the current average player a fair chance in drops. My friend will most likely boot up the game, complete the temple, then close it down and wait for a couple more updates. If so, he hasn't got representative drop rates for the loot in each area. If this continues for later patches, he will end up being worse and worse off because he hasn't spent the extra time required to get better gear. This may harm his view of the game in the future.
Circumstances are different for us in the beta because we have nowhere else to go and nothing else to do.
You and I are not representative of the people who play the game. This almost seems to me like you have nothing else to do. I've just bought 6 other games in the Steam Summer Sale, have university applications to start and work to do on my Extended Project qualification, as well as a driving test to practice for and normal school work on top of that. And extra 5 hours grinding for loot and cards isn't top of my priorities