Honestly, White Mages need to stop treating Benison as a mitigation tool and start treating it as a non-direct healing method.

Do you have a Lily?
Is Benison off cooldown?
Is the tank going to be attacked for a decent amount of damage in the next five seconds?

USE BENISON!

Benison is effectively a cure that generates minimal hate and can never overheal. You SHOULD be using it much more often than Stoneskin since it's both instant and uses 0MP and should be using it at every opportunity to augment your own healing powers.

You would almost NEVER use Stoneskin if a tank can withstand the hit without it since Cure II AFTER the tankbuster goes out is a much more efficient use of the GCD that consumes the same amount of MP. Stoneskinning weakened players now is a non-issue now since their maximum HP does not drop anymore with weakness.

I would take Benison any day over any iteration of Stoneskin, even when it still had 18% HP protection just on the fact it's both instant and MP-less.