I use them a lot to control the tone of what I write. Since periods can indicate a serious or angry tone[1], I often need some other way to indicate a separation between two complete sentences. For example: "It looks like you forgot to do X; that's needed to do Y." Using a period could be perceived as anger, but using a comma would make that sentence a comma splice. [1] https://youtu.be/fS4X1JfX6_Q?t=3m3s
Former professional journalist and tech writer here. Disagree. At least since Hemingway brief sentences using periods instead of complicated sentences separated by semicolons has been considered not particularly angry. Short sentences also reduce cognitive load on the reader.
I'm all for a semicolon though. It's a reminder that something necessary is comming.
I would like to nix most commas though.
I just don't see the need for them, except in technical writing. My wish for technical/scientific writing would be using numbers, followed by short concise sentences.
For example,
1. Do this with the wrench.
2. You need turn the 10mm nut clock wize.
3. Blah, blah, etc.
4. And even if I wanted to omit the comma, my brain can't seem to do it.