Review for NeurIPS paper: Logarithmic Regret Bound in Partially Observable Linear Dynamical Systems

To clarify, while PE is a common assumption in classical control literature, it is not common in more recent nonasymptotic work.. If one were to assume PE in the state feedback setting, then injecting noise would not be necessary and better regret could be achieved -- but lower bounds tell us that this is not the case. So justifying the applicability of the assumption in this output feedback setting is crucial, and I'm happy to hear that it ends up being a mild assumption satisfied by well known controllers.