Why is this good? Well a solely points based system doesn't make this distinction a ship worth 400pts is always worth 400pts in whatever level battle whether a 5000pt game or a 500pt game.
This alone IMO makes the PL system far superior - however, I do agree with you in that you can power game the system which is why I'm proposing a high PL but low FAP taking advantage of the new armageddon splits (see the Poll thread I have for details).
I see no Point why a ship what is a sitting duck in Pl is better then if its in a point system cheap to buy.
When i look over the rules Centaurie and minbarie are the big ones followed from EA and Narn. Why shoud any one play Liga ships like the vree they are under gunned poor hullrating slow manouverbal but slow.