I wish ProTools had sample accurate plugin automation. Plugin automation seems to be only frame accurate. For example, if I paste an EQ setting on a clilp, with a low filter on it (or any other eq). you will hear the sweep of the plugin moving to the pasted setting on playback. If you continue to play this spot, the sweep will be slightly different each time, I've tried this with most of my plugins and it seems to universally work this way. Automation should happen were we expect it.
It seems Automation has been this way always in PT and users just accept it. But can't we do better by now. Logic certainly has sample accurate automation (its actually a preference to enable as it raises the cpu load).