A parent-teacher meeting isn’t a general sit-together, rather contains a defined agenda for certain objectives. Being an educator myself, I personally feel that such discussions should occur on regular basis even if everything seems to be going perfectly for all the parties: student, teacher, and the parents.
However, the effort to prepare for the meeting is not a responsibility for the teacher only, but the parents should also come equally prepared.
Both the parents coming to the meeting with a clear and strong purpose in mind is beneficial, eventually for their own child. The effort to devise a unique output should be a win-win situation for all. I would advise parents to prepare a list of questions they would like to ask from the educator. As for the teachers, even if the student is experiencing the tiniest problem and demanding, “Can someone write an essay for me?” The educator should communicate these types of issues to the parents as well.