I support the change, though the rationale used for it seems to me to be nonsense.
Times New Roman might not be the world's most beautiful font, but at least is a little bit less atrocious than Calibri (which is awful). So, whatever the rationale invoked, I welcome the change.
Sometimes, when I have to work on documents which will be shared with many users, I use Times New Roman as serif, and Arial as a sans serif. Both choices are (admittedly in my very subjective opinion) better than Calibri, and it's almost guaranteed that every PC will have these fonts available, or at least exact metric equivalents of them.