Best practices are not bad if done moderately. Excessively following "best practices" is bad practice itself. In the real world, code isn't perfect. It is easy to write a perfect code to reverse a linked list or a perfect code for a todo app because people have solved that problem over a thousand times.

When working on complex projects, make sure the code is as clean as it needs to be, test and document when needed, but if you overdo it, you will waste a lot of time in an era where time is really expensive.