Hi,
I have to chime in and also vote for the re-introduction of PL on AO-51.
Whilst I agree with the sentiment about capture effect and just being better than the pirates, I also agree with the comments about battery power etc.
To add another perspective to the mix, I am sure there are many that would find it hard to differentiate between legitimate and non-legitimate traffic. Being one of those people that can only speak English, and not Indonesian, Malaysian, Cantonese etc etc, it's a little hard to differentiate between real amateurs and pirates. Though I admit regular exchange of callsigns is the habit of amateurs, it can still be tough with Multiple stations.
At least with PL, you can determine that there was real "intent" to be on the bird.
My 2cents worth....
Regards Andrew VK8AH