I like Scala. I've written a lot of Scala. But choosing a language is a team decision. And Scala draws the same kind of ire as C++. It's to the point that I have seen seasoned engineers laugh any time Scala is suggested.

To provide a bit more depth, a large number of the developers I work with (folks I respect) don't _want_ the kitchen sink. They see it as dangerous. Even if _they_ can handle it, they know that there are a lot of people who can't. Sure, you can limit the features you use via convention, but that is shifting a tech problem to being a people problem -- you usually want to go the other direction.

You can "yeah, but..." all you want, but it's a valid, reasonable opinion. It's subjective, but that's just the way of it.