The problem is that anyone who later needs to know what was in the meeting, even the two original participants, has no access to it. On the whole, more time is lost by people not being able to refer to what was actually said later than is saved by having it quickly and synchronously. You're making more work for yourself and everybody else in the long run.
Information overload. There’s tons of info on our Slack, but the vast majority is noise. If you saved transcripts from all Zoom meetings it would be mostly noise too. The benefit of meetings is that they be chaotic. Creating something succinct and sharable from them should be done later as a singular focused activity and stored in a wiki.