Of course it isn't invariably necessary to see the person you phone. That is over-used. On the other hand, the possibilities for online conferencing are in their infancy.
Although the opposite of a techno-pioneer, I would guess that in future, things will be normalised at a much better level. Perhaps it is analogous to the first unwieldy manual typewriter, after centuries of quill pen communication.
Probably a giant screen will be a standard part of any home/home office. Probably, there will be multiple small pictures of everyone 'in' the room, and an automatic enlargement and subtitles when that person speaks to the 'chair' of the meeting.
Presumably normal formal convention of any traditional committee would be followed, but with new advantages. e.g. the entire meeting would be aware that a certain few people were waiting to 'catch the eye' of the chair. Plus, everyone could refresh their knowledge of the name and essential info about the others 'present'. The option of speech recognition to type out what is being said would help those 'present' as well as doing the job of the minute-taker.
(It will do no harm to have the records as a form of re-training for the more male-biased meetings. i.e. possibly most)
For large meetings such as Climate Summit, this could and should be online as an example of how to do it. A main 'room' and a number of side rooms, (presumably with people able to switch their identity on and off), would allow people to discuss in small groups or individually in substitutes for 'bumping into someone'.