I would regard it as more of a feature than the point of the relic. And as with any feature, some restrictions may apply.

Arguably, tanks have just always been in a weird spot with stats/materia, all rooted in the known flaws of fight designs. As long as "more damage is more good" meta exists (and it always will as long as tanking/healing requirements are minimal), tanks and healers are always wanting to push more damage stats, all the way back to tanks favoring STR melds over VIT to push out a little more damage (see also: Stance dancing).