>trying to create one presentation which serves as a discussion aid and a formal document of record

It can depend on the context. A presentation that I'll give at an event is mostly fairly worthless as a leave-behind. It has relatively few words and is graphically rich. On the other hand, I sit through a lot of presentations at work where the slides basically are a document (in a form that a lot of people find more digestible than a standard text document). And if the speaker is good, they'll spend their interactive time hitting what they think are some of the highlights. I don't have any real problem with that.

One of the nice side effects is that if someone skims a slide of particular interest to them and they see something confusing/interesting, they can ask the speaker about it even if the speaker didn't bring it up.