These slides miss most of the point of meetings. You don't just go to talk, you go to listen.
Generally if you have enough information that you know what you will share and can expect to receive at a meeting, it should be an email. People can share things on their timetable in the style they are most comfortable with and the information can be reviewed without anyone needing to worry about meeting minutes.
Even when you are uncertain exactly what will be required or gained, email is still generally the better option. People can look up the answers to questions instead of speaking off the top of their head about something they were unprepared for, and people with low stakes can skim the conversation for the bits that are relevant.
Meetings are for highly unstructured, free-form communication where you really need to talk through something. That's not to say an agenda can't be useful, but it should be nothing more than a starting point. Meandering discussions that don't really accomplish anything besides sharing information no one realized they needed are the point. If the meeting doesn't efficiently accomplish what you wanted, that's because you used the wrong tool for the job.
Meetings are best when the communication is multiplicative. For example in a brainstorming session where people build off eachother's thoughts in rapid succession. The more people contribute, the more everyone benefits. Even very low value contributions may be key catalysts. You don't get creativity and emotional investment and comradery by keeping a tight schedule.
All too often people will try to lump a bunch of different things together into a single meeting which really should be handled separately, and then try to use the agenda to recover the specificity of the various portions of the meeting. This never works well. Because everything gets improperly handled in one meeting, you need more meetings to revisit the various parts, and oftentimes those too have other things mixed in. Often you'll have a meeting to prepare for the meeting with a select group, and a meeting to follow up the meeting with a different select group, and of course the results of these meetings beget even more meetings. The ubiquitous feeling that a meeting was useless is almost always because you had a legitimately useful reason for holding or attending the meeting that was not accomplished. You don't fix this by holding better organized meetings, you fix this by eliminating the need for these meetings.
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As an aside, I find it funny that there is a slide stating meeting attendance is a choice and then a subsequent slide listing optional meetings as a red flag.