I can't be convinced that turning every card into a 6% DPS buff is anything but miserable. It's ironic because I'd argue RNG actually died in Shadowbringers, not Dawntrail.
Seals, melee vs ranged... How big of a difference do you think it would've made to just toss every card onto a Samurai anyway? Because I strongly doubt the difference in damage would be noticeable enough to have any realistic impact in any fight anywhere. Sure, 3% is less than 6%, but consider how much less damage every ranged job except Black Mage was doing than a Samurai, and I actually wonder if a 3% damage boost on a Sam might actually compete with a 6% damage boost on a Dancer, or a Summoner even. The Seals in Shadowbringers forced some amount of interaction, but it was no longer about cards anyway.