A slide deck is an info-delivery ratchet. It does not allow the listener to process at their own tempo. Less obviously, it does not allow the speaker to process at their own tempo. With a whiteboard or other more improvised medium there is a possibility of speaker and listener coming into sync through the talk and mutual impedance matching. A slide-deck precludes, or at least constrains that possibility. To really deliver a talk capable of creating attunement with slides, you have to rehearse a lot, which limits improvisation (unless the rehearsals are in the form of improving repeat performances)

Blogger at ribbonfarm.com, running summerofprotocols.com, host of /gloom ☀️

Slides hinder speaker and listener sync. Whiteboards allow for mutual impedance matching. Improvisation limited by slide reliance