Design patterns aren't common _structures_. I suppose this is why everyone gets so caught up in the language specifics and think they're trivial. Design pattern

Design patterns aren't common _structures_. I suppose this is why everyone gets so caught up in the language specifics and think they're trivial. Design patterns are common _design decisions_. The strategy pattern isn't saying "you can have callbacks", it's saying "sometimes you should allow a policy to be supplied by the user". Every day, in every language, even the ones with first class functions and people posting on the internet that design patterns aren't needed, people still use libraries with massive 'options' arguments to functions, instead of internalising the actual lesson of the strategy pattern which is to allow executable specifications of behaviour. So yes, there are trivial things which you can argue the toss on, but in the last month I've used HTTP libraries that don't allow you to supply a strategy for retry logic and machine learning libraries that don't allow a strategy for early stopping.