Yeah, being cloned implicitly while in superposition (whether interpreted as many worlds or not) is what I was a was going after in order to address the fact that Wigner's friend situation doesn't have to be absurd.
That doesn't require us to clone an object; the argument only requires us to imagine how would it feel if it's happening all the time to us and conclude that we wouldn't feel a thing subjectively.
Of course, that's different from people being cloned all the time implicitly, aka many-worlds.
However, my instincts also tell me that reproducing quantum states for quantum computing must be basically the same thing as cloning objects, difficulty-wise, so I expect large quantum computers to become exponentially difficult to construct - but smart people who actually understand the math don't seem to believe that. So I don't have firm grounds for knowing the world works the way I think it does.