5 years ago, Paul Phillips was still a core contributor to Scala. Anyone seriously considering Scala should listen to his talk, titled “We’re doing it all wrong”, and take a look at Policy, his fork of the Scala compiler.

https://www.youtube.com/watch?v=TS1lpKBMkgg

https://github.com/paulp/policy

Previous discussion:

https://news.ycombinator.com/item?id=8276565