The main place I've seen these be useful is in ORMs. Metaprogramming allows you to decouple the business logic from the plumbing of query construction and memoi

The main place I've seen these be useful is in ORMs. Metaprogramming allows you to decouple the business logic from the plumbing of query construction and memoizing, while maintaining syntax that most people are comfortable with. Django ORM did a really good job with this. JS Proxy classes also use reflection. Check out the immer library for an awesome example of how those can be used to make coffee drinker to read and reason about. Reflection should be used very rarely, but it's an amazing tool when it's the right tool