Heisenberg did say you have to ditch it below a certain length scale otherwise you'd model Helium wrong.
I'm not a QM expert. I have been looking at it from the point of view of studying human cognition.
From that perspective, the completely objective reality consists of undifferentiated stuff. It is up to us to make distinctions. So a primary perceptual action is to categorize the world. Maybe it is better to describe that as "thingifying the world" -- dividing the world into things. And reality does not dictate how this should be done. Most of how we do this is driven by pragmatics. But that leaves some uncertainty that is not fixed by reality. And, as an example, we get to Helium by way of this thingifying.
This seems to fit with what I know of the QM point of view. When we thingify the world, that gives us a world of things. But that seems to be pretty much the same idea as collapsing the wave function. All of classical physics is about the things that we come up with as we thingify the world. And the uncertainty in how we do this seems to relate to QM uncertainty.
Fundamentalism - the anti-American, anti-Christian branch of American Christianity