>> 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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