While I somewhat get what you mean (and hate ribbbons), the Office UI is just way less crappy than LibreOffice's. It has smooth scrolling, some animated state, and they're at least trying to get rid of some visual and semantic cruft, so it's a lot less of a pain to use than LibreOffice.

Of course progress sometimes means breaking changes, software in general and especially LibreOffice is nowhere near a point at which we can afford to stop improving. It's not about changing things for the sake of changing things, it's about making things less painful (and hopefully ultimately delightful) to use.