DC's remarks from the previous page sum it up quite good. Though there are other aspects that gone wrong.
If DRS overtakes are not genuin, car 2 would overtake car 1, and car 1 would simply reverse the order again, just a lap later. This hardly ever happens.
Because the overtaking car is a bit faster. It was almost always this way. But before the overtaking driver had to earn his position with some hard work, now he does not.
DRS simply takes away the one element which, until recently, prevented car 2 from overtaking at all, and that's the effect of turbulent air taking away downforce when going through and exiting the corner prior to the straight.
It's not true. Think about it.
The downforce loss is a problem in the corners or during braking, acceleration. DRS doesn't address that, it just gives a huge advantage on the straights (where the following car already had some slipstream advantage). It's also hard to fine tune the extent of it's effect on the race. To really address the issue, they'd had to change the aero rules - mostly much more G/E downforce (proper one), less from the wings. The effect: more turbulent air resistant downforce, less turbulence. Something like this (though a bit too mild) was proposed for 2014. But the teams eventually protested it (cost or status quo, I don't know). DRS was meant to be just a interim solution, now it becomes permanent.
It's interesting that the biggest difference in total time came from the elimination of traction control.
I think something else changed, like the track layout. Or the laptime is calculated wrong. The TC ban didn't make the cars that much slower.
