I don't think that no classes without state is a good hard and fast rule. In some languages classes are the easiest way to get a new namespace, and thus in com

I don't think that no classes without state is a good hard and fast rule. In some languages classes are the easiest way to get a new namespace, and thus in combination with static methods they are useful in producing fluent APIs (which I believe are a good design choice). You could of course achieve the same result with modules but I'd argue it's cleaner to have an inline class than a separate file when you're only adding a couple of functions.