but 1BTC on MC =! 1 scBTC on SC in fiat terms. and that is the result of less security being on a different blockchain/ledger.
the equilibrium fiat price will be lower.
since you have such a hard on for the man Konrad Graf here is a quote from his paper :
The particular SBS must then offer added value sufficient to more than offset these negative factors from the point of view of users.
Let us the use then one of your favorite use case :
The 1:1 pegged Anonymous sidechain.
Let's assume now that such a sidechain is developed and after numerous reviews is vetted to be secure by some important industry members and other devs/coders. Remember it is all open-source and obviously long considerations and ajustements will be necessary before we obtain the correct product.
Assuming we do, the question everyone will then have to consider is : is the added value of properly implemented and securely designed anonymity built on top of Bitcoin valuable enough to offset the POSSIBLE (but not guaranteed) issues of securing the sidechain and ensuring proper implementation of the peg.