It annoys me. Someone on the committee of a group I belong to has a joint email address with his wife, and she reads , and passes comment on, all the emails he receives to do with group business. (she is not a member of the committee.) She is not a pleasant woman, does nothing to help the organisation in any way, but is overtly critical of the actions of those who do.
Her husband, a most pleasant man, is most certainly not lacking in computer skills; there is no point in making an issue out of it because matters discussed are generally trivial, and he would definitely leave than upset her, but it is highly irritating.