I do not like the easy kick off returns but it is hard to outlaw them etc.
However, banning the movement of a blocker is a easy and sim thing to do.
it seems like most nano have been fixed. One that is back is the running your MLB, Safety around, it confuses the AI (you just think you are making a great play. I'd add to that the "dancing defenses" when a owner has his players move from side to side etc. IRL, with your D not being set they would be blown off the LOS and driven 10 yard deep.
Most leagues I'm in are so tight they squeak when they advance......being in one that is more open is a plus although it took me a few games to understand that certain things were now legal.