Seems focus is on positive differences, but I have seen the reverse a lot; switching native to web because 'everyone is doing it', switching PHP to 'something that doesn't suck', migrating off c# because 'M$' and many others that really hurt (and killed) projects. I did see projects improve as well but that was almost always because it was code from an 'old' team where the framework and programming language was not optimal (to say it lightly) for the new team.
