I think this is a natural reaction to advice being over prescribed and totally agree that in your free time you should do whatever it is you want and this is solid advice.

BUT I think we should also acknowledge that everything that slows you down in your free time has a reason for existing and most of that is communication or knowledge sharing within a team. Naming conventions, unit tests, and general documentation all exist to help other team members keep up with the pace of changes in the repository. If you're not planning to do something in a team setting or for this to be consumed outside of the work that you do then you don't need these things. But if you want to share with everyone else it's important that you don't totally ignore these things because it will come back to bite you in the long run.