[Richard]

Umm... so it'd have been fair for England to have 17 out of 22 overs as Powerplay when they knew they only had 22 overs to face?

No.

India played their Powerplays as if they were batting 50 (or for 3 overs' worth, 43) overs. That's completely different to knowing that Powerplay will be in force for the vast majority of your innings.

Mind, given that England's batsmen performed infinitely better in the just-concluded game with non-Powerplay in place than Powerplay, such an outcome might well have seen England knocked-over far more cheaply than they were.