Suppose that they are called by their is names to be consistent so when different teams creates some asset code/xml'/animations/different exports and so on, its understood for what asset will one be naming. For example most of the time animations and code setup are done by two different people so not create any confusion they always are IS designates. So they are located it that folder under that name so code points correctly without 2 people having to chase one another and see how its named/exported. That's just one blunt example...
Second, in order not to create any confusion or inconsistency, since MWLL project founders decided that assets would follow that naming, current game leads/devs are following that decision. Imagine that created (unreleased) asset(s) come out having their "true" names/nicknames/whatever I gather that first question would be "why are they named Y when the rest of them are x". The way I see it, it works flawlessly for the team this way and that's all that matters... Suppose that that can be changed on the buy menus with more elaborate explanation for each asset (I would be the firs guy to cheer for that). SO... now all we need is more people who love and understand flash and are willing to work for the pure personal pleasure.
*beast voice* JOIN US...