The purple materia at least still see some use and I'd like if more jobs had the option to build sks/sps vs crit, like BLM. That seems to be one of the easiest ways to encourage build diversity even if it's a binary choice between crit and speed.

As far as I know for piety there's at least different tiers you can meld depending on how much of a cushion you want for MP, although I don't know how many people do that in practice but it's there at least. Tenacity on the other hand is a completely dead stat and I don't know how they'd encourage its use other than making bosses whack tanks so hard that they absolutely need it for its damage reduction, or giving it some other effect.