Have you ever though that in fact collateral approach multiplies a money supply by 2?
I.g. if USD has a value then USDT backed with USD also has value - then it means that both have a value and therefore you have existing USD money supply + newly created USDT money supply
This way I can back USDTT with USDT and say that USDTT is backed with USDT an so on
USDTTT backed with USDTT
USDTTTT backed with USDTTT
USDTTTTT backed with USDTTTT
USDTTTTTT backed with USDTTTT
and with your philosophy they all will have a a value
But in my case we burn one supply and create another in another form and even in another place. I burn 1 ETH and emit 3500 USDX - and the total value does not change