I think stewards need some leeway for that track limit rule to be effective, IMHO so far they are doing a really bad job enforcing it though.
Here is the case where you need exception :
https://youtu.be/aljfbhxtdyc?t=4m31s
Max divebombed Bottas and proceeded to push him off the track while being side by side, I argue that Max may have had no chance to turn more in at the exit to make room for Bottas, room, which Bottas was entitled to, since they were side by side, but Max pushed him off the track limits, now if the rule was very strict, Bottas would have needed to slow down when he saw there was no room for him on the track, and let Max go, and then open an inquiry with stewards about Max not leaving the room for him, but instead what happened, he went wide off the track, maintained speed (mostly, thus technically still gaining an advantage), and tried to prolong the fight by reentering the track side by side with Max, which didn't quite work out.
So some gray area needs to exist in that rule, but also the drivers need to understand and respect that, not use it as an excuse to cut an inside of a corner, meaning - shortening the track and the rest is already very much talked about.
I totally agree that the penalty for cutting the track short was in order, else this nonsense would continue and lead to even uglier things in the future. If you stretch this really, I mean REALLY far, Max could make some donuts around the start finish line by going off on the grass, go backwards, and cross the line again and advance the lap counter and claim - look, everyone is already leaving the track, so this must be legal!
