Good point, it would be a good thing to have indeed BUT:
Firstly, it wouldn't be a [CHANGE] per se, but rather a [FEATURE] ?
Secondly, NOT NEEDED full stop.
And lastly please allow me to explain. I believe that both of you posses fully geared character / characters to do almost anything in the game. While I am aware that not every mob has every drop available in the "?" drop menu thingy and it may be frustrating you can bet they are working on it or at least they have it on their schedule.
Ok then but what is to be done then? Easy. And also to quote you "SIMPLE". Get off your ass go to HL or where ever you want to drop whatever and simply kill the mob. Need x or y herb in HL? Go there kill the mob and find out who drops what herb in 2 minutes. Write it down if you want. Post in on the wiki everybody complains is not completed. Start a thread here and post it here if you really want to help. You got the point i think. Peace.
edit: the real CHANGE starts with "you".