I agree that BBs need improvements but why remove the EMB?
I know that there are many other ways to get them and at more efficient rate at that but that's only considering you have the resources including the knowledge, or put in more effort.
Removing EMB would cripple new players because I know quite a few players that are relying on selling magical stones from converting EMBs as a stable source of income in-game (would've been nice if other conversion choices are good too).
I, myself, relied on EMBs to gain resource to buy what I needed back when I was still considered as a new player (done quite alot of BBs after TIs to get my KvM too).
You may say they're either doing it wrong or such but not all people know how to access all the information lying around about the game (which is why there are still people posting stuffs in forum which would be found on, for say, the wiki/database [ro db isn't even updated]).