If you're defining Linux as a kernel, then yes, the kernel does not impose any constraints on userland that would make this impossible - and I never said it did

If you're defining Linux as a kernel, then yes, the kernel does not impose any constraints on userland that would make this impossible - and I never said it did. If you're defining Linux as a complete OS, then the fact that it's conceptually possible for libraries to behave this way is irrelevant; they could, but they don't, and any solution for distributing apps needs to deal with that reality rather than just asserting that everything else should be rewritten first before anyone can do anything.