[thinkharderdev]

I've been writing Scala for the better part of 8 years now and I have my list of gripes about the language, but this is one I have never understood.

Yes, there are different code styles you can use with Scala (standard vs infix notation, parens vs braces, etc) but all of that can be standardized with code formatting tools.

In terms of FP vs OO style I don't think that is different for any other language. No matter which programming language you choose you have to make decisions about what sort of patterns you want to use in which scenario and enforce that across the team. I have seen many Java projects where a relatively small codebase has approximately every GoF pattern implemented somewhere (and a few novel patterns just for good measure).