No, money doesn't scale any other way. Collateralized coupons are how you use an asset most efficiently. Surveillance is up to you. Do you want a layer 2 coupon with a custodian? Then you've chosen surveillance. You use liquid or e-cash you have a multi-custodial model reducing surveillance. You use lightning you have the least surveillance and most control. Base layer assets can either be secure or a fast medium of exchange, not both.