I agree with your comment so much I created a login.

'One thing I miss about in-office work is that people would spontaneously draw diagrams in meetings.

The same diagrams would get drawn over and over again, evolving. And everybody did it'

I miss in online meetings the start with and highlevel outline diagram, and fill in different detailed sets depending on the conversation.

I like plantuml, but it's hard to do that as fast as a white board.

Also I found that repitionion of explaining your system to multiple sets outsiders really helper refine the content.