Whenever I take the train at night I always sit in the front car because that's where the operator is and it's safer. Having trains with no MTA emlpoyees at all is not a way to have a safe and reliable transit system.
Also NYC door operators are in their own cabin so they cannot really see the people anyways. They don’t have the training to do anything about an incident
In other words a no difference in personal safety between a driver only or driver and guard operation.
I’m not aware of any evidence of reduced safety in any category after introducing DOO, and if there as I suspect unions would be screaming from the hills. The only measurable impact I’ve seen is on accessibility (which doesnt mean that’s not a consideration)
Note: I do take the train daily, just I live in Tokyo