I mean there are plenty of examples in the wild left and right.
Have you ever seen basic db optimization? Alone in my companies people were just using stuff wrong.
Performance and Architecture are a after thought in our industry. A normal developer doesn't think about it.
There was one query in my company which was running in one region slower than in another one and there was also an explain statment available. No one looked at the explain statement and thought "huh why does this simple select use so much memory". People weretrying to see why the regions themselfs were different not what the problem with the query was.