Well I get what your saying, but I think it's not bad to want the same effect that Protects gives, but just to allow variants of it instead. They wouldn't stack or anything, if you have Protect active but you then cast Shell for example, the timer just resets and the buff sign would just be replaced with the latter that's all, or vis versa.

True they are only 30min buffs, but there is no Shell or Reflect as a role spell in this game and that's pretty sad considering they are in nearly every FF, and it would definitely be pretty cool to have both available regardless of the effect they end up giving.