I would also very much like to be able to revert to the old comments. Mostly, I do not collaborate in the dynamic mode for which the modern comments were introduced. More often, I develop a text (say an agreement) with another person in an off-line or semi-on-line mode, when we share our comments on the developed text once in a day or two. Sometimes with one- or two-days breaks. In this mode I appreciated the possibility to have the history of developing the text preserved in the comments with functionality of commenting on comment, with the possibility to reply to comments, resolve comments etc.
Modern comments enforced by automatic 365 updates are therefore for me an unwelcome change and I would appreciate very much the possibility to stay with the traditional comments.