[JazCE]

You're right, but i think the point you're missing (and i don't mean this in a rude way) is that they had a system built in scala, somehow, but now no one on the team knows scala.

They lack an architectural oversight, that they should really be using one(ish) language rather than a big mix of languages so that this doesn't occur again when no one on the team knows GO because the project leads taken a new job.

[girvo]

Retention. Also, I'd suggest that your average dev will learn Go quick enough to work on this router quicker than they'll learn Scala; I prefer Scala myself, though! It's a balance between proper tech choice, correct management choices moving forward, and dealing with management mistakes (like letting someone build the router in Scala when the rest of the team don't know it) from the past.

A crappy PHP dev will learn Go a hell of a lot quicker than Scala, IMO. A safer choice, for their team and position, IMO.