I would not agree though. It wouldn’t matter much if you torque to 17 or 30ft/lbs - the filter element won’t go much lower (therefore wouldn’t compress itself between top and bottom to deform). The outside lip on the plastic filter holder will prevent it. The only thing what makes it different- it will be a pain to unscrew it later.
In regards to the plastic insert - it’s being attached to the cap with the clips. I simply tried to remove the old filter element a bit too passionately and element sat very tight so I accidentally unclipped the center. If you have the same housing take a look on the filter holder. You can remove the center piece if you really want to.