SE obviously wants players to be able to switch from Pugilist to Miner on the fly, but does not want players to be able to switch from Conjurer to Gladiator in the middle of long battles/Guildleves/Factions etc.
I doubt SE anticipated all the gear swapping that eventually developed in FFXI, but they seem intent on preventing job swapping in FFXIV.
In that sense the point allocation system is a complete success, not a fail.
Taken from the FFXIV Official Website:
The Armoury system is one of the foundations of the FINAL FANTASY XIV experience, simultaneously being both the impetus behind character development and a key factor determining individual gameplay.
By merely equipping any of a variety of weapons or tools, players can instantly change their active skills, thus enabling them to dramatically alter their style of play as well as their character’s outward appearance. To take an example, let us follow a day in the life of Leeroy.
Leeroy recently chose to begin the journey down the path of the gladiator, trying his hand at the age-old art of swordplay for the first time. Even today, he woke at dawn to spend the daylight hours drilling relentlessly on the tiny wildlife just outside of town. Alas, opportunities often present themselves when least expected...
An Unheralded Invitation
Without prior notice, some friends invite Leeroy to partake in an expedition to some nearby ruins. Upon joining their ranks, however, he observes that the other party members are seasoned warriors and accomplished mages all. Dismayed yet not given to despair, Leeroy sheathes his sword and takes up his well-worn staff, assuming the role of thaumaturge, his most advanced class. He bids farewell to the rodents and worms and races to meet his companions, basking in the confident light of his spellcasting abilities.