I play a TON of ProAm too. My comments earlier in the thread was before XB1 users could get the patch. So I was going by the posts people put up about how they felt towards the live ball physics.
I actually agree with you here and this is exactly what should've been done to level the playing field. In ProAm last night post patch 4, I still noticed turbo over dribbling ball handlers were being punished just like PRE patch 4. I also noticed the shooting was tweaked slightly to make it more difficult to hit contested shots. Last but not least, I witnessed 2 kickball violations called in 1 game. First against defender running into the offense player to bump you and try to pop the ball out of you and second when the ball was loose and someone ran for it kicking it accidentally in the process.
This is all on ProAm and not any other mode. I noticed in MyCareer though that I could turbo into traffic with less consequence; not substantially less, but enough to notice a change. I don't play "Play Now" and the park has become boring and less enjoyable so haven't tried there either.