There are a couple sides to every issue, though. There was some fault with Rosberg's new engine that it couldn't be used. There was no concern of penalties with respect to him.
And look what Ron Dennis did with engines at Spa. He took massive advantage of the easing of the rules, and I'm surprised that everyone didn't do that at Monza and open up and try every engine in their garage.
Bernie has a lot of problems, but again, there are two sides to that coin. First, you're not going to handle the massive egos, expected underhandedness, and years of experience within the teams with an inexperienced pushover running F1. Also, the teams had a pile of input on engine numbers and engine design. Mercedes was the one who didn't want more engines allowed, aside from the token proposal of one more, since they are well ahead of the curve on the reliability standpoint. The fact that they didn't raise a giant stink about the easing of the engine use rules is probably because they don't feel at risk no matter how many engines are allowed now, at this point in the game, from a financial or points perspective.
If they were so concerned about cost and reliability, the teams should have stuck with the previous generation of engine design. I wouldn't object to that. Obviously, though, they did.