Historically, yes, as an aspirational goal. Even if, in practice, a lot of people didn't want to or didn't get around to creating a doc to go along with the presentation.
That said, I've seen a real trend over the past decade of a lot of people wanting to consume content/ideas/etc. from a slide format rather than reading paragraphs of text. So it's pretty normal--at least for routine information sharing--to create a text-heavy presentation and just hit the high points when presenting from it. Not sure this is even a bad thing for a lot of purposes--especially to the degree people can put together cogent sets of bullet points but aren't that great at pages of prose.
I prefer long form content... but spending time in the comments section of HN may show a revealed preference.
I concur with your observation. Piling on with a couple examples:
- Axios is a news service that only delivers information in bullet points. Unlike their long-form competitors, they are expanding into local news. [0]
- Long form content, such as books, are less popular. The average number of books read each year has fallen to a 30 year low. [1]
[0] https://www.axios.com/local/columbus/2022/11/22/introducing-...
[1] https://news.gallup.com/poll/388541/americans-reading-fewer-...
My conference presentations don't generally have a lot of words. But that's not all I do and it does mean my conference presentation slide decks aren't super-informative on their own.