I can find no con about it. The rule helps with overtaking and side by side racing or you can just block every attempt just like Max did here and you get the old usual static overtake in pit stop racing from the old days.
But subtle enough to not get the referees on him.
I would be more hesitant to do side by side racing if the car ahead is at any point allowed to block me and do numerous line changes even when on brakes.
I don´t think Nico looked more beat then Hamiltion or Ricciardo. Hungary is a tough physical race. For sure as a Merc driver how can you be fully satisfied unless you win. If he went on celebrating like second was a victory then I would agree he look broken. But he just lost the race to T1 nothing more then that.
I love that the camera men ignored that booring battle for most part. I guess they will start complaining about that again or was it Red Bull that last time complained about to little tv coverage for being to dominant?