You're only wrong in one respect: economists don't only look at steady states. Keynesian macro looks at frictions, for example. Economists are quite aware that

You're only wrong in one respect: economists don't only look at steady states. Keynesian macro looks at frictions, for example. Economists are quite aware that inflation propagates through the economy unevenly; they are not that naive as a rule. I did learn general equilibrium in grad school, but we were not told that it was a precise description of reality.