Also the fact that the economy is managed can mean things aren’t always testable. If you think there’s going to be a recession based on models and you prevent that by using policy, did you really prevent the recession or was it never going to happen?
Progressive taxes are a way to make up for the imbalance of poorer people spending a higher proportion of their income on essentials, it’s a fundamental of economics. Although I have heard that the tax brackets in Russia are completely flat (not that that makes it any better).