So, I just skimmed through the Wikipedia page and it mentions that Denver had a lot, but some where removed.
It cites the few corners in NYC that have them.
It says that there is concern that people will go against the light, because the wait to be able to cross is a longer wait with a scramble.
It mentions that it’s usually put in at intersections that have heavy pedestrian traffic. It actually mentioned some in DC when I lived in the metro area, I don’t remember coming across one.
Also, in NYC they mentioned a mid-street crossing at Union Square, that I use all the time. Typically, pedestrians are supposed to cross at corners, but there are pedestrian crossings all over America not at corners.
I personally wouldn’t do a diagonal cross unless it was marked for pedestrians (I assume these intersections are marked for pedestrians?) or if I had an entire crowd of people around me doing it. I just wouldn’t think to do it.
https://en.m.wikipedia.org/wiki/Pedestrian_scramble