I hear what you're saying and have had some of these thoughts myself, but some thoughts:
- Despite my own suggestion of a heal for solo content, I don't actually think that a solo ability is either sufficiently useful nor in keeping with the general design of FF14 classes.
- I see where you're going with this, but we already have an ability that modifies ninjutsu - Kassatsu. I'm skeptical that layering other ninjutsu modifiers on top of Kassatsu is a good idea. (For instance, Kassatsu and Ten Chi Jin already don't play well together.)
- Similar to (1), I like this idea but don't think that it works. An ice-based group barrier could be cool, but it'd basically only be useful during those periods where a boss is winding up a big attack and everyone is just standing there; outside of that, it's hard for a shield to be useful. Encounters can't be designed around a NIN shield, so the NIN shield would be largely superfluous and likely not compete with just doing damage.
