As a Scot, I hope I have this correct, but from what I can Make of the ruling, the Indians as the first team batting, were expecting to bat for 50 overs, so therefore presumably, would have been more conservative in the early stages of their innings.
This is why the England target is therefore, higher than the Innings by India, as the English batsmen can then treat it as a 20/20 match.
I gave it up when you needed a calculator to work out run rates, when the last hour started, how many overs to lose because of rain, and when you started to use a light meter to decide if it was too dark to play.
From the explanations given here, which I still can't make head or tail of, it was a good decision!
We lost because we are told that that is so, it's not something that many in a spectating crowd will ever understand.
Cricket rules have never been easy to understand once you're past the basics of batting & bowling. I've been going to test matches for 30 years and still find out little things I didn't know about now and again from the TMS team... maybe I'll fully understand it one day:)