MS Teams has a really nice feature (that is probably an antitrust problem) where you can present a PowerPoint deck directly using the JavaScript version of PowerPoint. The slide deck is popped into Sharepoint, you get the presenter view and everyone else gets the slides. The slides are rendered locally, so they're scaled properly to your display and all of the accessibility features work.

And this is exposed in the UI in two ways. In the 'share' tray, you can select PowerPoint presentations instead of screens or windows, and you get this view. In PowerPoint, there's a huge 'Present in Teams' button right next to the share button.

And yet, 90% of meetings I'm in where people present PowerPoint slides over Teams, they don't use this. And that was even true when I worked at Microsoft.

I honestly don't know how you'd make this more discoverable.

So now I have a lot more sympathy with the MS Office team's problem that 90% of the feature requests that they get are for things that have already shipped.