Maybe, but rev's x displacement = fuel use. If they want to reduce fuel use, then give less fuel during a race. If they want to reduce the cost of engines, introduce a rev limit. But that is enough, having a fuel flow limit is stupid.
Edit: Sorry if that sounded a bit angry, didn't mean to
Lets try to see it from a different light:
- fuel limit got greatly reduced
That was before the engines were even in concept stage, and initially no one even knew if and how they´d be able to reach those. No one had built an engine like these before, so no one had real data to check on.
- fuel flow limit
But they had experience with turbo engines. And they knew what toll a turbo takes on an engine. Knowing that in engine development and usage is one of the biggest cost savings available (not just for the manufacturers, but for the small customer teams as well that now have to buy less engines), they introduced the FFL, so the turbo would be held in check, greatly reducing the strain on the engine, thus making them much less likely to break.
- rev limit got greatly reduced
They went from 18000 to 15000, again guessing with no data on the new engines.
Now remember, in the first race of the season the "experts" expected cars to coast home, with teams being in fuel problems. No one even broke 10500 rpm.
Right now we just saw race 6 of 19, and no one really gets into any kind of fuel problem, quite contrary we now see rpm up to 12700. So yeah, I fully expect even this year cars getting to the 15k limit, and if not this season then at least in winter testing to next season.
All I want to say is, lets give the new rules time, until the magicians actually get to them, and lets do a conclusion after the last race. As you surely saw from my posts this year, I´m very excited by the new cars. No more driving on rails, actually seeing different driving styles.