Maybe what the Objective-C runtime does isn't really needed? It doesn't make much sense to have every method patchable, it doesn't make much sense to be able to

Maybe what the Objective-C runtime does isn't really needed? It doesn't make much sense to have every method patchable, it doesn't make much sense to be able to build classes at runtime, and it doesn't make much sense to have all calls go through a trampoline (with a selector that must be get with another call).