I think it will cause much trouble if there isn't a rule for cutting, because we drive ~460+ laps and u can gain easy half a second there, i would say only the attemp to drive clean through the chicane will slow u down compared to a team who ignores it. The guy who drives clean through there receives than a 4 Minute penalty ((460 * 0.5 seconds)/60 seconds = 3.8 minutes) over the hole race for doing the right thing.
In my opinion a rule is needed for that, maybe something like the tires on the left side have to be clean otherwise u have to lift for 3 second's or even better a layout like in the MOE + a guidline how to act if it wasn't clean like lifting throttle. The MOE admins are very experienced i think and they don't have their layout without reason. With an admin looking there it will become random because the admin doesn't has a clear guidline how to act, when it's a cut, when it's not. And for me as racer, i just can drive through there how i think it's correct and have to hope that the admin think's the same.