It seems to me that your issue isn't story points themselves, but the usage of them.
Story Points (in combination with Team Velocity) - allows PMO to forecast delivery, to know if the set of requirements is achievable by the deadline or not.
Story Points isn't, and shouldn't ever be, a way to measure developer productivity (either within a Team or between Teams). There's better tools for that job (such as Git Quick Stats).
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It seems to me that your issue isn't story points themselves, but the usage of them.
Story Points (in combination with Team Velocity) - allows PMO to forecast delivery, to know if the set of requirements is achievable by the deadline or not.
Story Points isn't, and shouldn't ever be, a way to measure developer productivity (either within a Team or between Teams). There's better tools for that job (such as Git Quick Stats).