Left hand turns have always been a big source of accidents. The pre left hand turn designs saves live and time. So do the Thru U turns.
I like them both, but I dont like the Thru U turns as much because that's what I do a lot of times to save time. Where you need to turn left, but the line is so long, so you go through the intersection, make a a U turn, then turn right the direction you want to go. So it feels like they are taking away what I already liked to do because if everyone has to do it, then it's no longer a time saver.
But again, left hand turns have been hurting and killing a lot of people. Trying to find a way around it is a good idea. I think gameface is over exaggerating the problems pre left hand turns cause. It's fixing more than its causing.