How is comparing Scala and Node to Go comparing apples to oranges? My argument is that people are using the three languages to do things in the same space: building backend servers where concurrency, mostly in IO, is a major factor.

Based on the feedback I've received on the talk, I could and should make a better argument next time, and I welcome feedback on what I should be focused on. However, I think it's totally fair to compare the three languages because they're often used for the same purposes.