Do you mean that all is worth is code ? I code as a living but wouldn't say that all I do is coding or in a text file. By example talking with X is worth noting or setting up a complex embedded device with all its tooling is definitely worth noting.

Well, most version control systems can be used outside of coding too. I know a few authors who use Git to track and handle multiple revisions of their technical or fiction book writing.

No reason you couldn't have a text file with setup notes on a system and have commit any updates so you have a trackable log.

As a contractor it’s useful record things like attending meetings, presentations, research etc that aren’t code.

In fact for any employee it’s useful to keep track of stuff like this, come PR time.

Yeah commits are great for logging code changes.

I started using the did file while learning a new language, don’t remember which. I’d have 15 tabs open with different docs and tutorials but very very little actual code written or way to mark where I was. I settled on a single text file and It was super helpful to just look back a week and notice there was some measurable progress.