WhM has piety on every weapon this tier, which does feel like an intentional (and frustrating) push towards that stat.

That said, BLM has a nice chunk of SpSpe on both the crafted and Ruby weapon, so the lack of it on the tome weapon probably wasn't intentional. And SpSpe really isn't ahead enough to make a noticeable difference and can even be melded if you want a set amount for your rotation that badly, unlike Piety which is 100% a dead stat in most cases.