If you get sufficient value out of a 30 second summary of an hour long meeting, then why have the hour long meeting?
(h)(n) + (t)(p) = W
(h length of meeting in hours) x (n number of people in the meeting) + (t number of hours prepping the meeting) x (p number of people prepping the meeting) = W number of work hours spent on this meeting. Multiply W by the average hourly wage. That's how much money the meeting cost. And that doesn't factor in the cost of productivity loss because everybody could've been doing something useful with that time instead.
If it could've otherwise been ten minutes of writing an email and five minutes per worker reading and understanding it, then how is it anything other than an efficiency gain to just make that meeting an email? Instead, we're still putting the meeting together just to then pay in resources and possibly subscription cost to have the meeting summarized instead of just having the host do it in the first place.