For me, the sword thing is only the common syndrome of many series. Once someone state that something/someone is the most put your favorite adjective here. Then, as the story progresses, they feel the need to make something/someone more put the same adjective here than the most put the same adjective here. The Laconia weapons were the unique items in PSI, but the needed something more in PSII, then the Nei weapons. In PSIV, for its turn, they needed something more than Nei weapons, so they made Elsydeon. In a hypothetic PSV, there would be something stronger and so on...
This happens a lot in hero stories, specially in animes/mangas. An this usually creates weird situations, like enemies that should be very powerful in essence ending being weak and enemies that should not be so powerful ending being strong. A good example of that is Dark Force, who was supposed to be the ultimate force in PSI, PSII (well, almost) and PSIII. In PSIV, though, the first Dark Forces are rather ordinary enemies, weaker than later "common enemies" and they introduce a new "ultimate force", being Profound Darkness. If there was a PSV, most probably there would be a new "ultimate force", stronger than Profound Darkness...
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