[swift-evolution] [Review] SE-0117: Default classes to be non-subclassable publicly

[Tino Heth]

>> When was the last time you you thought "I really wish the author of that library had restricted my options to use it"?
> 
> I really wish Objective-C had this feature from the start.  I believe there would have been significant benefits to Apple's platforms and ecosystem.  The reasons for believing (or not believing) this have been discussed in depth so there isn't a need to rehash them now.
I'm not asking for reasons but for a single persuasive example…

It is easy to claim that everything will be better if we add restrictions, but so far, I haven't heard of any real problems cause by the current defaults:
The motivation to change them is not because of actual experience, it's just the trendy opinion that inheritance is evil.
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