Articulating the ineffable. Programming language theory 
cognitive psychology. PhD @Stanford
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(as reference counting techniques become more efficient, we may see some of these performance issues with GC become much less of a problem.)
It’s not just about efficiency but API semantics. Many langs have proxies for scoped destructors, eg Python with-block or use of try/finally in Java. You get this for free with ownership but need a separate feature with GC.
Ah good point, although, you can make that happen with a ref-counting GC: allocate an object (with the appropriate finalizer) at the beginning of the scope, and then drop the object when you exit the scope.
On the surface it seems like this would work, because if you had any cascading destructors, they would naturally be acyclic. But perhaps there’s a lurking nasty subtlety
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