I've had a (relatively) bad time with Scala codebases. The last one I was involved in was like a 6-minute wait between making a code-change and being able to run or test it. But I still wanna work with Scala devs.
I'd rather work with Scala devs on a Java codebase than Java devs on a Scala codebase.
It's not about intellectual appetite though. It's about not re-litigating the same crap at every new work place. Avoid mutability and nulls where possible, etc.