it´s very clear the car did not meet set targets from day one.Thge cooling was and maybe still is marginal ,so from early on they clearly had decided things they could not setup in reality .The KERS was marginal in race 1 as well ,basically the whole car for whatever reason was late .and it still looks unfinishhed ...so setting ambitious goals is one thing but to load too much on your shoulders is the other.As we can see they again fumble around in the airbox area when almost no team has similar solutions ..so this seems to be an area where lots of roads can be followed but no real gains can be made...otherwise we would see converging in design as this area has not seen many dramatic changes..Two team FI and Lotus even adopting Mercedes invention for this year-so why go back and come up with another variant ....again a lot of work engineering hours to put in new molding concepts new fabrication concepts instead of refining what you have done originally.
It looks like Dr.Frankensteins laboratory with every idea some guy is coming up with applauded and followed and then dropped after realising it was not THAT brilliant and jumping on the next idea.