I'm not convinced it even works very well for either of those cases. It's common in many applications to return the result of a computation as an object in memory, like an array or string of arbitrary length or a treelike structure. Without the ability to allocate memory which exists after a function exits, I'm not sure how you'd do that (short of solutions which create arbitrary limits, like writing to a fixed-size buffer).
Well, yes, but I'm trying to be generous to the PoV.
My preferred solution is definitely to use the GC. With some help if you want. You can GC the nursery each time around the event loop. You can create and destroy arenas.
