Input lag is how you could tell when gaming. It wasn’t your eyes, but what your brain expected to see.

Have you actually tried some of these technologies ?

Extensively. He is sponsored to sell you a product.

You are VERY correct in your deduction that motion blur tech is a far bigger hitter than just up’ing the refresh rate.

Why would you ever want a refresh rate that high?

I did my primary coursework on this exact topic in college so I feel rather aptly in the know here, and VDU’s with displays above 100hz have diminishing returns and anything above 200hz is completely indistinguishable to the Human eye.

Anyone who says otherwise either has superhuman eyesight or is just lying.