I won't presume to answer for the OP, but my (remote conference attendance) pet peeves include: I have printed out important information (but forgotten to email it); let me use the whiteboard that is mounted on the same wall as the camera to illustrate a concept; I will speak exactly loud enough so that only people in the room can here me; I will use the free tier of some conferencing service, and start the call fifteen minutes early so that the connection drops halfway through the meeting.