I mean, that is true in the same way that if I want to create some shrutebucks and loan them out at the schrute reserve rate you are also free to loan out shrutebucks at whatever rate you want.
The fed may have a small advantage you are willfully overlooking.
If we believe neoclassical theory then if the fed sets the rate too high we get deflation and if the fed sets the interest rate too low we will get inflation and we will get those things very quickly with very little delay. This means that the policy rate would have to mirror whatever the optimal market rate is.
If we accept some minor inflation, then the fed is always setting the rate a bit too low rather than too high.
In other words. Whatever the Fed does, it is mostly irrelevant.
On the other hand, if there is actually some leeway and elasticity then monetary policy can actually result in increases in economic welfare. In this scenario we want to see some utilitarian meddling.
The fed may have a small advantage you are willfully overlooking.