I think this is even overblown. Verizon makes heavy use of Scalaz, but not all projects are done in 'scalaz' style. This works out OK. There isn't always time to onboard new folks to a fully functional style (which is the overall company culture/preference), 'typesafe scala' is certainly very pleasant to work with.

That's one of the strengths of the language. You can be productive from day one writing 'java++' style scala, and slowly move to the functional side at the speed and level of 'purity' you desire.