I would like to see custom stats but because 3.2 is going to change the tanking stat influence (and this could happen to other classes in future for all we know), I think they should be adjustable without too much hassle. For example, they could have all custom stats controlled by materia, so that instead of having to throw out your relic and start over, you would simply get the materia removed and start that part over again. Imagine if they made Parry really useful in 3.2 after everyone had avoided Parry for the entirity of their relic customisation.