[swift-evolution] Final by default for classes and methods

[Tino Heth]

> Frankly, I think having `final` in the language at all is a mistake. While I agree that we should prefer composition to inheritance*, declaring things final is hubris. The only reasonable use case I've seen is for optimization, but that smacks of developers serving the compiler rather than the converse. Bringing an analog of NS_REQUIRES_SUPER to Swift would be most welcome; that's as far as I'd go down the path of dictating framework usage.
I really like the direction this discussion has taken ;-):
Is there any counter argument beside performance (which imho should always be seen under the aspect of premature optimization) that speaks against making NS_REQUIRES_SUPER the default behavior?
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