This is all very true, and I agree completely. But you've overlooked two very important factors that I can think of:

1. Many people attending these meetings do not have the authority to cancel them, and the people who do have the authority may not be receptive to this argument.
2. Some people will benefit from assisted notetaking even if the meeting was worthy of the time.

I'm neurodivergent and when I'm writing notes my brain shuts off audio processing. I literally can't take notes without missing more of the meeting than I'm writing down. And unfortunately most people above me in the hierarchy can't fathom writing a message instead of speaking for an hour.