White Mage's role is that of a healer. I play White Mage because it's a mage that prevents people from becoming dead through various means, not to cast any specific spell or spells.

White Mage had lots of stuff for Regen spells at the level 75 cap because MP efficiency or longevity was vital to the healer role at level 75. Since then, a lot of things have changed. Cures are now very MP efficient for White Mage, and even if Regen spells were made more MP efficient than Cure spells again, MP efficiency is not as vital.

I think spells and abilities are seen too much as possessions and not enough as tools to fulfill a purpose or perform within a role.