Anything that disrupts the natural movement of the body will be problematic. Whether or not you believe the ankles should be extended intentionally during the pulls of the lifts, they will extend to some degree as part of the effort, and any hitch in that movement will be a limiter.
I don't believe that most people will function best by forcing themselves to stay flat-footed in the extension - but I also don't believe they should be intentionally plantar-flexing. I believe that everyone is thinking way to damn much about it instead of just lifting.
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