While I get your general critique I am not quite clear if you are critiquing me, including me with the science inspired confabulators.
Just in case you were including me in that:
For the record, the many worlds interpretation just sticks with the field equations of quantum mechanics (extremely well tested).
It doesn’t invent the quantum collapse, which actually isn’t necessary to interpret them and which raises many questions that have never been well answered. I.e. when does collapse occur, how is information conserved if collapse keeps injecting information into all quantum systems, in situations with time reversal (different orders of events for different viewers in relativistic scenarios) how is information being destroyed. On and on. Collapse is both an unnecessary and problematic interpretation in an attempt to avoid a continuation of superpositions.
What we see as collapse is just the experience of being included in the field equations as the quantum systems information becomes too complex (via thermodynamics, information escaping the experiment) for superposition to be detected anymore at a practical level.
But as we learn to control larger and larger systems, we do indeed find superposition isn’t bound by mass or system size. In fact, all of quantum computing depends on it not being bounded. It is just a challenge to keep information in isolation, I.e. from spreading in a way that is unrecoverable.
Just as eventually we will be able to “simulate” intelligence in a quantum computer, we are already intelligence in a quantum system. We just can’t control the quantum information in us so we lose any systematic relation/observability to the superpositions of our particles.
Chemistry throughout our body operates consistently with the quantum behavior of all other chemistry. Our particles are no different from any other particles.