[throwAGIway]

This is exactly the problem - the advice is valid, but the developers can't see their implementation is not, and my examples of maintainable code seemingly go against the advices.

They think their huge class diagrams and statically unverifiable mess of many structurally identical classes (in Typescript) is an example of DRY, composition, separation of concerns, inversion of control and encapsulation - all the great advice neatly packed into 50 files opaquely interconnected through dependency injection containers, where a simple 100 line function would have done the job and wouldn't cause a major headache for the poor guy who has to fix a bug in 3 years.

The root issue is that these guys never were the poor guy who has to fix a bug after 3 years. They moved on after a year or two of "implementing best practice approaches" to the next job.