I have a feeling you have no idea how to program anything in any language whatsoever... call it a hunch. "can't even edit the vanilla code" gives it away completely.
Also that post is 3 years old, how does that make it "current devs"?
You just sound extremely jaded because that's the cool thing to be.
you are totally right and i don't know how i missed it, making vanilla servers is much easier than making 20 slot bags
these current 'developers' can't even edit the vanilla code to make the 16 slot bagpack bigger, which you get at level 1 with your refreshing spring water and tough jerky
We'd love to be able to upgrade it too, but it's not as simple as upgrading it. It was coded into the system early in the development of World of Warcraft and isn't as easy as writing up some new lines of code. In addition, we're not sure that simply adding a larger backpack is the solution people really are looking for. You'll get a few more slots, but you'll most likely fill those relatively quickly.