I don't know about the big airports, but I do believe it would enhance
safety for us little guys, in many cases.

Once I am in position, I can no longer see traffic approaching from
behind me on final. It would be OK if I was only waiting for a takeoff
in front of me, but not if there is anything that might be--or get to
be--behind me. That's the situation that led to some confusion in a
situation I have referred to here before.

It might slow things down a little bit in the margin, but then again, a
collision slows lots of things down a whole lot... So at least at
first blush, if P&H goes away, I'm not going to cry a lot.