I don’t see the big deal with little changes. All that matters is that the TBC “sandbox” is accurately represented in the overall and I think everyone will be happy to play it over the obviously unreliable options available otherwise (#rememberFelmyst).
Classic in general was enjoyed. It succeeded overall despite it’s little modifications. The scope of the changes in TBC are a fair bit further reaching but they are in good spirit with the betterment of the expansion, not the ruining of it.
Now the boost? That is bad tbh. I can’t find anything good to say about that.