To be fair, in some quantum computers, it does work. For example if you count a beam of photons following the same path with (almost) all possible polarization

To be fair, in some quantum computers, it does work. For example if you count a beam of photons following the same path with (almost) all possible polarization combinations as a qubit, that is indeed closer to "everything between", however it's got limited utility indeed when compared to the broader view.