Those that don’t know these patterns are way less of a problem than those who know them, know that it would be better to use them, but reject to do so. Because

Those that don’t know these patterns are way less of a problem than those who know them, know that it would be better to use them, but reject to do so. Because they are effectively lazy and don’t care about other people that have to work with their code in the future. Unfortunately, there are many of those. What I often find is that management in organizations rewards these people because they get quick results. The cost to the customer and the team is well hidden until it’s too late.