My vote is for Lingots
Having been chosen for the test run of the gems system, I can say unequivocally that I prefer the original Lingot system.
Please don't change over to the cheesy "gems". If you have to monetize, monetize the Lingots.
Duolingo required that I select one of the courses I am taking to post to, which I thought odd but still I wanted to express my opinion. I don't know if my vote will help. I know that Duolingo used my Irish course to test the new gems for a while and then just reverted it back to lingots.
If you edit this discussion, at least in the Web interface, there is a green button on the upper left that says “Topic: Irish”. When selected, it shows a list of other discussion areas where the discussion can be moved; one of the options is “Duolingo” for the Duolingo Discussions area. Do you have the same topic button and discussion area list when editing a discussion from an app?