Really not the place to comment about fundamental differences of PPLNS and PPS... Both have their benefits, and both have their downfalls. Quite seriously not knocking your pool, would prefer to see more people take an open policy. My reply was giving people more info about your pool that you felt strongly enough to post in someone's pool announcement thread and then quickly retort when someone thought some more info would be needed.
No, you made a vague statement about PPLNS implying something that is based on someone being able to do something impossible: predict when a block will be found.
And since you missed a more important point:
There are 2 mining strategies that should not be used by pools.
Prop and PPS.
Prop, since hopping will mean long term miners will be paid less per share than a well informed hopper.
PPS, since block withholding will not affect the block withholder or other miners, but will be a direct loss to the pool, so any small PPS pool that receives a withholding attack shouldn't expect to last long.