Landlord named as additional insured on PM's policy

[Payman A.]

Hi all,

So I've seen/read plenty of threads on how/why PM should or shouldn't be named as additional insured on landlord's policy.  Assuming that is agreed on and PM is in fact named as AI, why wouldn't landlord be named as AI on PMs policy?  Of the 2, PM stands to make more mistakes without landlord's knowledge vs other way around so it seems landlord would have more reason than PM to be named AI.  Thoughts/experiences?