In the hands of a lot of people though Powerpoint is a tool for insulting the intelligence of the whole room.
If you want to understand without attending a presentation then what you want is a paper, or book. Those are very different formats.
I've given many presentations where I has to provide the slides, which were then repeatedly emailed as samizdat. Easy 10x as many people only read the slides, but a document would not have reached them at all.
It all depends on your audience.
Manager wanted to add a ton of content that they felt would be helpful. I said sure, and added it to an appendix with arrows, callouts, additional definitions, etc.
I then presented it to the CxO group -- we only discussed that first slide. I emailed the deck, and got comments back saying that the appendix was confusing but they loved how simple and clear the single non-appendix slide was.
I've always tried to follow the 4x4 rule: no more than 4 lines, and no more than 4 words per line. I've found icons and occasionally diagrams can be helpful in explaining more abstract concepts. Also, slide notes are used liberally.
One place I worked was veeery similar to what you describe here. PPT was considered docs of record since no one wanted to make formal memos and have those enter the control system. My approach had friction, since I would be extremely concise and direct people to the slide notes if they had questions. In this org, people were notorious for lifting slides from others decks for their own presentations (hence I would distribute as PDF to discourage this) since people would not field questions those slides might raise.
Just like native apps do...?
https://developer.mozilla.org/en-US/docs/Learn/CSS/Building_...
It does have a default Page Zoom setting and it will remember Page Zoom changes per-domain (e.g. I have this site set to 115%).
There is a way for web sites to make use of iOS's Dynamic Type setting [0] to make text larger, but it's up to each site's author to include the requisite values in their CSS.
[0] https://www.interactiveaccessibility.com/blog/text-resizing-...
Browsers are native apps, so they already do that for websites.
From time to time people complain and say I need to "get with it", but not a single person has complained they couldn't read them from the back of the room!