Once you use any technology to a significant extent, you understand its strength and shortcomings. I've probably written tens of thousands of lines of code in Delphi or C++, Java and C# too to some extent. I've depended on those languages, but gripe about them too. The new girl (or guy) obviously has the advantage of just being new. Since I haven't written anything significant in Scala besides Tetris, I haven't hit the shortcomings yet.