Likely it has less to do with them not having ideas, but rather it just being easier to balance classes that are similar. The ability to maneuver around mechanics easily regardless of whether the loss of that ability is what hurt certain classes or not is an extra factor that would need to be taken into consideration when balancing the classes. The addition of casting times to maintain maximized DPS helps mitigate that factor. Having similar support also means that the two "Support" classes have less distinction to figure out when balancing.
On topic, I'm uncertain if I care about DPS or Tank Samurai ((Tank skill, take all damage to your clothes and hair tie)). I would like someone to share basic armour with Dragoon though.