I'd love if this is something we saw more frequently in schools.
My writing didn't really start to improve until college when I wrote some research reports for a semi-retired professor who took the time to wean me off my bad habits and write in a scientific style.
[1] Maybe... https://quoteinvestigator.com/2012/04/28/shorter-letter/
But over time people feel the need to stuff more things in them and you end up with 40 slides decks that defeat the purpose.
It's no fun to exhaust my audience.
If you're trying to pitch someone on why your redundant project shouldn't be canned then you should probably keep the slides simple and to the point and add in any extra stuff you need in the delivery of the presentation.
Write a 1-page brief. Make a tabloid-sized poster. Write a blog post. Save your bullet list in a plain text file somewhere. Scribble the main ideas on a chalkboard. Slide decks are the worst possible medium for use outside the context of a presentation (heck, they are a pretty terrible medium even for that context).