Whenever design patterns come up, folks start talking about language features. First of all, it's about natural language to describe a way of doing something.

Whenever design patterns come up, folks start talking about language features. First of all, it's about natural language to describe a way of doing something. If you don't have a language to describe a design, then folks could and often would implement incompatible pieces. By having a common language, you solve for that. If I gave you two piece of wood and asked you to join them together. How would you? Does it matter how you join them? It absolute does matter. You might use nail, you might use screw, you might do glue. In carpentry there are design pattern for joints. You can tell someone to use a butt joint, a box joint, a pocket-hole joint, etc. Without these higher level language of design. You will have to explain and you might find out that explanation is not enough, you would need diagrams or models. The same with programming design patterns, without it, you will waste time explaining or drawing diagram. For the professional, these are the colloquial phrases of programming. If you're an enterprise application developer, or a game programmer or a cloud dev, your languages and often used patterns would vary. I say this as someone that learned lisp as a 2nd language a long time and a fan of functional languages. DPs are worth knowing and understanding.