Yes, in my company some of the fastest proposal writing has been done during lockdown as 3-4 people co-author the same document online via Word. It works very well.

We use it for meeting agenda / notes.

The note taker takes the note, while other people queue up the topics to talk about next.

I'm not suggesting this is the best way to take the meeting note and I'm happy to hear about the alternatives, but it is reasonably usable.

It doesn't look gorgeous either. People wouldn't like to distract the meeting through the doc, which is projected to the large screen in front of everyone.

NCIS has been doing this for years: https://www.youtube.com/watch?v=u8qgehH3kEQ

Often in Google Docs and Notion, however usually it's in separate sections of a document. I've never seen three people writing different points on the same bullet list - sounds like it would result in an inconsistent writing style or conflicting information.

We have a brief weekly status meeting where we have a word document that's used as a reference - where one person owns each section. Rather than share screen, everyone just opens that file, and see the live changes.

It works OK.

No, but as others have said I've seen it with multiple people in different parts of the same document. Demoing 3 cursors on screen at the same time expresses the capability of the product in a couple seconds, explaining how you should actual use it would have taken longer and killed flow.

We use Miro realtime with live cursors etc. in online workshops. It's ok.

Only for vacation planning where people are researching and inputting suggestions on a spreadsheet, or where people are brainstorming on a docs sheet.

I did that kind of thing often enough when i was in school, usually while in a room together with the other people editing the document.