The problem there is that it allows people with deploy privileges to unilaterally change the rules. So you lose "code is law". Hypothetically, you want to custo

The problem there is that it allows people with deploy privileges to unilaterally change the rules. So you lose "code is law". Hypothetically, you want to custody of assets in an immutable contract with the minimal amount of privileges, and use proxy contracts for higher level on-chain functionality. But it's not so clear to me that it's possible to achieve a perfect factoring, in general.