[stcredzero]

That really doesn’t help. How do you know that what you are doing is a “mistake” if it works?

Keep looking at it and ask if you are doing something redundantly.

The only feedback you get as a sole developer are your compiler and errors in production.

False. There's plenty of resources online. There's plenty of code to read online. There's plenty of potential critics online.

You would never know that it isn’t a good idea to write your own AcmeDatabaseManager or AcmeLogManager.

Unless you've read the Internet. There are plenty of database and log utilities out there.