For a conference that is based on a piece of technology..
Why do so many wordcamp organizers do not do livestream. Every track should be livestream. Get a sponsor for each track live stream. Asking for a live stream is like going to a Star Trek Convention and screaming Star Trek is better.

If it is because sponsors want something in person, you can put an ad on the livestream with logo of sponsor.

Some organizers said that it is too much effort.

No it is not. I speak from experience.

Every WordCamp should live stream every session.