My kids completed PADI open water in 2007. CESA depth was about half of what we did in the 70's... but even my 11 year old had zero issues performing a CESA from about 30'.
I can also say from 1st hand experience that in 2007, a Horizon Divers(Key Largo, FL) PADI OW class performed a CESA drill from 50'.
Ooohhhh, the horrors.

You know what, diving is dangerous. We shouldn't put students in the water during their class, they can get hurt......