I wonder if that was because the OHPs could be quickly destroyed after the fact with no electronic evidence remaining? After Columbia, electronic evidence was quickly removed - hard drives etc
I don't think so, there simply wasn't time for M-T to create a PPT presentation. NASA wanted "Reasons in writing - NOW" as to why they should delay the launch. M-T engineers responded as best they could in the minimal time allocated and then were denigrated for an 'amateurish' presentation subsequently. The inference being the quality of the presentation was more important than the content.