Sure, it's an improvement over gold, but the 99% of people who don't care about verifying gold reserves also won't verify bitcoin reserves, they just want exposure to the price.

How many people bother to verify binance and coinbase's utxos and compare this to their accounting books?

Moving coins from coinbase to Bitrefill is only a thing because the banks don't let you hold paper bitcoin (yet). When they do, there's no need for real bitcoin to be in the loop at all unless the user really wants to buy something which cannot be purchased with anything other than real bitcoin (that's the forcing function I'm saying we need to build).