That's a valid philosophy but it isn't what SBD is.

SBD is a managed pegged asset. It is essentially managed by people who are not literally central bankers but metaphorically are in that they perform similar functions, as described in the Steem white paper (for example, setting interest rate policy). It literally isn't possible to avoid doing so because there is an interest rate parameter and a decision must be made what value it should take (potentially including 0%).