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And you'll be quicker to automate the next thing, since you have more experience automating.

It also creates documentation/repeatable processes.

Also, learning, though that can be hard to justify.

The automation might, in some cases BECOME the documentation.

I disagree. If your automation isn't well thought out, edge cases might just screw every target and you might have hard time rolling it back.

In my experience, that is the unusual case, not the ordinary case.

Further, when that would happen, it is typically obvious that some bigger change has occurred which required the automated procedure to be updated and tested.