Watching the game change since the 1960s. The current PI rule was in response to DBs intentionally interfering on deep throws. NFL wanted to enhance the passing game and changed the rule. Now the WRs are causing PI by their actions. Since it is a judgement call, the NFL does not want a review done. The experiment several years ago cured them of reviews. Look for the NFL officiating staff to have the refs be more aware of the intentional short passes or WRs causing contact in the off season. Doubt there will be a rule change.