Agreed. I have no problem with HasTak "daring" to add new bonus features to subsequent versions of a toy. Why not? I think it's a pretty cool idea.
I personally only have the original Hasbro version, and I have intention of getting any other version. If someone who already has a previous version really wanted the throne that badly, they could sell off their other one and get this one.
This is what Grimlock's throne looked like in G1:
Given the size, I'd be impressed if the throne was actually sculpted from plastic rather than a fold-up cardboard prop (akin to MP01 and the original MP Ultra Magnus' trailers).