I don't think that argument holds up. See quantum mechanics.
replyQuantum mechanics is demonstrable on a lab bench (or smaller), so your counterargument is completely wrong.
replyAny useful consequence of a physical effect is, in effect, an experiment that could test that effect. So if the smallest test is with a machine the size of a small country, no device using the effect can be smaller.
You're in an IT forum and can't imagine implementations of both the smallest and largest scales? ICs are built at nanoscale and have to deal with quantum effects. PNT systems are so large that they have to deal with the speed of light and relativistic effects.
replyMany things humanity builds are on the scale of colliders.
> The problem is that fundamental physics
I didn't know there was a problem. It seems like one of humanity's greatest successes.