On the second, that is a strawman of what I said.
We will have to disagree on this. I will just ask, if you are on offense, and throw a deep ball, what will clearly be a touchdown, and the DB tackles your WR, are you going to really be happy with a 15 yard penalty instead of a 60 yard touchdown?
Think Brandon Cooks touchdown against the Vikings. You think the rams would have been happy with a 15 yard Penalty instead of a 48 yard Touchdown? How about the vikings? Do you think the DC would teach, or the DB would play a different tactic/strategy if the penalty was 15 yards? And yes, Cooks had a step on him, and yes the defender could have tackled him.