I think today was the first time we saw the new 5sec s&g penalty in action. Personally I don't think it is very good.
If you are penalised before your final pitstop then the penalty is just five seconds, just a slap in the wrists. A spin or a dodgy pit stop would cost you more than that. It's not really a penalty.
But If you get the penalty after your final pitstop then it is basically a 25-30 second time penalty. There is no way to recover from that in the final stages of the race.
I suspect that this season we are going to see a situation where there are two similar incidents and both getting the same penalty, but with drastically different results. This is the stuff that the FIA should be very very careful about when making rules and rulings.