I think it's worth noting that with other pools you would have zero chance of getting paid for shares discarded during bad luck times. At least here those shares are never forgotten.
However, unlike PPLNS, you also have no chance of ever being paid more than PPS.
You win some you lose some

Yeah I'm not sure that a tiny chance of a dust payment at some unknown time in the future is worth much of anything. Maybe if you could transfer it to someone else for free.

The purpose of pools is supposed to be to get rid of those very small possibilities and indefinite timelines, isn't it?