I was able to talk at length with an engineer from a prominent Cup team last week. During the discussion, he said that this new car is a total POS as far as being able to do anything to help it. He said you unload with what you unload with based on sim programs, and there's next to NOTHING you can do to help it. If you start off out to lunch, the weekend is lost because you're pretty much out to lunch. They can't experiment and take huge swings like they could with previous gens. The whole "it's saving teams money to be uniform" is opposite of what's happening, because the big boys are spending like hell to find the tiniest edge since everyone is in the same box.
TLDR; the engineers hate this car because there's no adjustability in a weekend. If you suck on Friday, your whole weekend is blow because there's nothing you can do.