[sharikous]

Are you familiar with physics?

What engineers work with is, maybe, 1/1000 of our physics knowledge (maybe 2/1000 for electronical engineers who need a solid basis of quantum mechanics).

Our physics knowledge is maybe 1/1000 of what we roughly know should be there but cannot be probed (quantum gravity, nonlinear field theories, dark stuff...).

The Universe is so huge that it is pretty impossible to descrive how much bigger than us it is - probably infinitely.

The point is, between the stuff that we know and the stuff that we roughly know but don't really know - we know a lot more than what we can use.

Saying that something is not so useful technologically, as OP stated, is rather a safe statement. We know a lot about fermions and bosons, light and electrons - and we know sufficient information to be able to state when something is overhyped and not really useful as it seems