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The obvious benefit of extension methods is that they allow us to append methods to a type *after* it has been defined. But an undervalued advantage is that they append methods to *types*, with all the flexibility Scala gives us to specify those types precisely or generally.
For example, we can extend `Seq[String]` with new methods while having no bearing on `Seq`s of other types. Or we can append methods to `Product & Serializable`s, regardless of the actual class or trait that implements `Product` and `Serializable`.
You're right, except when it doesn't work. One common gotcha is that class methods have a higher priority than extension methods. And we can't specify priorities for extensions defined by 2 different parties.
E.g. if you define an opaque type + flatMap is very different from a class + a flatMap method.
The later can specify a flatMap method with a more flexible signature than Monad.flatMap, whereas the former cannot do it.
Kind of pisses me off 
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