@jarkko @josh @jvschrag I agree about meetings, but also agile is a scam, scrum is scam^2. Well meaning but scams nonetheless, imo.
Anyway, I think you can measure the value of a meeting in a very utilitarian way - take people's pay/hr (with appropriate multipliers for company costs), aggregate it, sum it to length of meeting, also calculate the revenue generated by employee/hr, add that to the cost and ask 'was this meeting worth that?'
One common failing you see in meetings is that it can be super beneficial for manager X who now doesn't have to chat individually to A, B, C etc. but while X and A speak {B,C...} are literally wasting their time, and so on.
This is a sort of laziness/costly efficiency from the point of view of a manager, whereas those meetings would do better as one-on-ones with a brief summary (via email ideally) describing what's going on.
There's a sort of intrinsic assumption that by just listening in others gain value, but this is simply inapplicable in the typical JIRA ticket assigned top down thing you get in modern software development.
Typically your manager tells you what to do, and you do it. I think many of the methodologies assume things are collaborative and grass roots controlled in a way that they simply are not (usually) in practice.
The most useful meetings are targeted and designed to give value to everybody present + respect their time.
However I think the clash between reality and corporate politics means that rationally assessing the value of meetings is something that just wont happen.