Anyone who says to not use ruin II doesn't know how to play the job clearly. In an optimal summoner rotation you're going to lose a lot of DPS if you aren't weaving in ruin II between GCDs and during dodge mechanics. Anyone who says BRD should just play ballad doesn't know what they're talking about either. A BRD is going to reduce his damage for 1 person? Yes it's true that healers need ballad too sometimes, but a SMN will probably run out of MP much sooner. Paeon is different as many DPS benefit from it. Having a BLM in place of a SMN means that a BRD can play foe's more often and only ballad when a healer needs it. I think a relatively simple bandaid fix would be to add additional piety to the summoner job crystal. Right now equipping a SMN job crystal adds +10 PIE. If they changed it by +20 or +30 more we would have a higher max MP, our aetherflow would restore more MP, and we would have a higher MP regeneration.