[agumonkey]

It's vacuous concept.

Also you're leveraging anonymous function syntax which is, interesting, to say the least. In Java 8- you'd have to write boilerplate class named after a pattern. Lastly creating something from outside information was done since forever, it's trivial when you don't invent ceremony around it. Hence my conclusion, it's a waste of time and effort.

[native_samples]

No, because you still need to name the thing the function is assigned to. What exactly should the user of the function call it? thingMakingFunction? You need a consistent way to refer to "a function call that creates an object in a particular state" and factory is as good a word as any.

Yes, in Java 7 or below it'd have required more verbose syntax. So what? That came out 8 years ago and Java isn't the only OO language with a notion of factories. C# had delegates much longer than Java had lambdas, and it also needs a way to talk about "a bit of code that produces objects complying with a contract", so also talks about factories.