My thoughts. Making lower level uniques into rares is pretty much the last thing that I want addressed as far as MP goes. "So players don't get their hopes up"......................? You'll live.
Nobody uses potions? Well that's news. I'm fine with the chest setup giving you potions. Maybe give me an option to sell all my resist potions save spirit.
You're unhappy that you can be on your katari and have a staff upgrade drop? Or on your alch and a griffon bow drop? What more do you want........seems like a fine setup to me.
As for the "white whale" comment, that's the entire point of a loot based system. To constantly strive for that last upgrade. If you're implying you want more comparable top tier weapons, i'd say there are a good handful already. Griffin bow better for hunter while maker bow arguably better for archer. There's other examples as well, with 1h's and staves. I swap out staves frequently depending on the group comp. Not sure what more you want.
More weapons in future DLC's is most likely going to happen, and yeah I'd love that too.
While craftable weapons isn't a terrible idea, I feel like adding more and better looking armor (with previews) should help with unused mats.