There is a ton of problems with the usefulness, in any practical sense, of quantum states. When we are dealing, as all human-matter relationships are, at levels where humans can engineer how matter is determined and handled, we are not dealing with matter in any quantum state; not that any human tools of empirical evidence can use.
When quantum physics is so mature it is a mere part of everyday physics and humans can make everyday use of “quantum physics” then people should start taking a real interest. Until then it remains a curiosity.
One word:
LASERs
Well, quantum tunnel microscopes have been around over thirty years.
Quantum hall effect has been used in resistance calibration for over twenty years.
I’d say it’s more than a curiosity.
It’s just the opposite. Our everyday perception of the world is replete with quantum pehnomena. For example, metals. How would you explain them? Classicaly, they were accepted ad hoc. But Quantum Theory easily gives an account of their propeties.
Of course, this is not to mention the periodic table of the elements! That is the Quantum staring you in the face. I supposed you accepted it as rote, like verb conjugation or something.