I can take off and land a small plane in a simulator without looking at the instruments at all (except maybe a couple glances at the air speed indicator as I set up for landing), and I've never flown in a real small plane.
I always thought visual flying was a crutch and instrument flying is the "real thing" that I know I can't do.
The kind of flying you're doing (basically) is called VFR, for visual flight rules. You keep an eye on your instruments of course but a lot of the flying is getting done just by looking out the window.
While a trained pilot certainty CAN fly on instruments alone (which is a separate certification on top of your regular license), no sane pilot would choose to ignore what is happening outside if visibility is decent. GOOD pilots like to have all the information they can, at all times.
These days it's common for PPL student pilots to undergo a little training under simulated IMC, but inadvertent VFR flight into IMC is an emergency condition and, if I understand correctly, is the top cause of fatal VFR aviation accidents.
But something constructive: Consider enrolling them in the Young Eagles (https://www.eaa.org/eaa/youth/free-ye-flights) if you haven't already.