I used the analogy of a dog (right arm) running in a straight line and the leash (left arm) keeping him in check. I may be wrong but I don’t think the ‘dog’ needs to be running in place trying to escape but just have a constant and deliberate inline exertion. More like walking into a strong wind or pulling a heavy load behind you. Extensor Action snaps the left arm into being active the way a Bungee cord goes from relax to taut- not relax to double its length.
I think because of the way the left shoulder joint naturally works, the dog would never be left running in place (he'd run in circles - hinge action). The dog is the pull.
So I'd lean to saying you can't have too much extensor action. The "problem" of "too much extensor action", probably, in reality, is a left arm that is not properly left alone to be inert or a piece of rope. I'd say you need all the properly produced structure you can get (by stretching the left arm).
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