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System diagrams.

I've never drawn seen anyone draw a system diagram using any tool more quickly or better than they could on the back of a napkin.

If you start from the get-go trying to wrangle a UML diagram or Lucidchart, then your mind is immediately guided to do only the things the tool makes easiest.

That's why when you're inventing something from scratch, a pencil and a piece of paper are best. Of course, if your handwriting is messy, go back and use a tool later for your colleagues' sake.