That sounds like a gigantic pile of rationalization for why proof is unobtainable. It sounds a lot like my religious school teachers telling us about “Do not put the Lord your God to the test.” This powerful being is totally real and definitely takes visible actions in the world but don’t try to check this fact because it stops working if you try to check it.

Tons of human abilities are affected by our belief in them. Medicine is more effective when the patient believes it’s effective, to the extent that pills with no medicine in them can still have an effect if the patient believes it will. Do we just throw up our hands and say, crap, it’s super hard to figure out of any of this medicine actually works? No, we sit down and design experiments that account for it and end up with a massive library of proven drugs.

We don’t dismiss this stuff because it’s controversial and seems incompatible with a materialist worldview. We dismiss it because there’s no good evidence for it and no proposed method of action despite decades of trying. Arguably millennia of trying; “remote viewing” and similar things are just new framings of ancient religious ideas. There’s no actual difference between attempting “remote viewing” and praying for a vision.

And sure, it’s possible this stuff is real. But when there’s no conclusive demonstration of it after thousands of years, the burden of proof is firmly on the people who think it’s real, and it is definitely not the job of the rest of us to take this stuff seriously.