Functional Programming in Java from a Scala Addict (coderwall.com)

Perhaps he doesn't forget, but wants to speak about what you should do today. Or, perhaps he doesn't know about Java 8 lambdas. Ultimately, your comment would come off a lot less offensively if you had said something like "Interesting article. I wonder if Java 8 lambdas will change this. <link>".

Probably because it won't matter for the next few years.

If you use features of Java 8, you force everyone of your clients to use/switch to a Java 8 runtime, too.

Whereas in Scala even the newest version happily runs on Java 5 (released in 2004).