The issue starts with 'Audiovisual Illiteracy'...
Historically PowerPoint is the descendent of the Magic Lantern (which goes back to the 1600s!) ... parented by the tape-slide show and the overhead projector. - Slightly displaced (since about 1890) by - and moving in parallel with - its cousin the moving picture, whose vernaculae and communicative structures go back to the early 1800s...
revelstokereview.com/entertainment/the-art-of-the-magic-lantern/
If you can bear a slightly longer read there is a PDF online: 'Performative configurations of the historical art of projection'
That literacy is almost entirely independent of the technology... When a medium is new and exciting, it's often claimed that
it is the message. However once that medium become routine and accepted and part of the everyday, then the lack of technical and structural 'literacy' becomes an issue.
...The childless aunt and uncle who would spend their summers on cruises or other foregn trips; complete with 8mm cine camera, returning with 500' (about 40 minutes) of auntie standing waving in front of some historic edifice, followed by uncle - maybe followed by the two of them if a volunteer could be roped in. - As impressed and fascinated as one might have been with the 'tech', such presentations are the stuff of nightmares!
But of course at the time - as bored rigid with it as we all were - everybody said it was wonderful; unwilling as they were to give offence. - Which only encouraged them!
Powerpoint is fine... it's an essential part of most 'lectures' and in that sense, hard to get away from. Just don't overdo it. Incidentaly; have you ever thought about why 'Dragons Den' generally make people use more 'traditional' audio-visual aids in their pitches... live demos, samples, dancing girls even!