If you replace a SAM with a PCT you gain 1% cDPS at 95 and up or lose DPS at below 95 and you trade a party shield for stronger personal survivability. That’s not going to enforce a double caster meta because there is no reason why PCT couldn’t just take up only the default caster slot. And if it allows for more “1 melee 1 ranged, 1 rezz caster 1 selfish caster” as an alternative to 2/1/1 that’s not a bad thing
And I’m not sure how MCH proved that at all, disassemble is a pity addition because the job was straight up being locked out of PF for its low damage. PLD is more just “we’ve long since accepted the devs refuse to make PLD’s damage good”