Hello, personnally I got the opposite impression. I was expecting something very big, and it is, but it's because it's packed with a lot of goodies and everything had to be well protected. If half of the boxes came with broken diorama etc... we would not hear the end of it.
The diorama was actually way smaller than I expected, and that was a good surprise, because I was not thinking to expose it somewhere, but it's not huge so it can fit in most busy shelves. If you really watch it you should be amazed by all the details, I was surprised, by example on the Drow.
But yeah I agree that I would have prefered an option to not get the diorama and instead other things, or a better price without diorama (or not paying the game two times). But I'm still happy that I bought everything.