Well, I just stated that the maths is not correct or at least misleading (because "60-70 battles in a day" won't be possible while staying above 50 % ECR). That's nothing dramatic, but I wanted to point it out.
I personally don't care so much anyway about optimizing my ranked rewards and ECR. I focus on tournaments and simply have no time to play more than 30 games per day (just sometimes if my wife plays, too, with my account, that might happen).
So if at all the new ECR formula is beneficial for me.