I agree with everyone here - modern Comments just appeared in my document today. Struggling to remain polite and respectful. No warning, no explanation and my work totally disrupted. I work in the legal industry - I only exchange documents & comments under careful control - I would never collaborate directly online on a document. So none of the features Microsoft have introduced help and the down side is I keep forgetting to do the extra click to 'post' so end up accidentally editing the last comment instead of writing a new one.
I really thought that after the 'lets remove the Windows button so everyone has to pretend they're on a tablet' debacle that MS would have learnt they need to allow people to CHOOSE whether to use new features. Apparently not.
Wishing I were back using WordPerfect and actively looking for an alternative to Word