+1 I also say that language polyglots are generally a much better find than those who build their career around a single language to rule them all. Although some of us promote JS as pretty close to that, even JS has a C/C++ base under the covers.

It's hard to get any new system to be seen seriously. It took the better part of 3-4 years for NodeJS to see any traction, and even then it's misunderstood. I continuously see people following the same patterns in building Node modules as they would for C# libraries.

It looks like you've at least tackled what is a very hard part in many organizations, and that is infrastructure. Not to mention, the new code can intermingle with the old (at least for a while).

I like FP paradigms, I find that it definitely leads to better unit test coverage... Not that unit test coverage is everything.