Of course I have considered similar allowances for Rc (this has nothing to do with stack allocation by the way, I'm hoping this is not a misunderstanding on your part). I referenced RC Immix throughout the post. It is extremely clear that the author of the article did not consider such allowances because they do not see that there is a problem. Even if the author had done so, there is a big difference between saying "whatever, I could do that same thing for Rc!" and actually doing it--a hugely nontrivial one that has not been fully bridged until quite recently. These kinds of techniques are still not used in production languages with reference counting garbage collection, including Swift.