It is certainly not worse than anywhere else (see for example what happened with Windows RT/Metro ... that was certainly magnitudes worse and Microsoft still de

It is certainly not worse than anywhere else (see for example what happened with Windows RT/Metro ... that was certainly magnitudes worse and Microsoft still decided to do it (or the breaking changes in C# 5)). The only exception is Java, where everything is basically frozen after release and cannot ever be changed anymore. Most of the time, targeting a newer version in Scala is just a recompilation away, like on .NET. So if you are good with .NET, you should be good with Scala, too.