Yes, the White Wizard can do those things but in 1 round? With a Knight, Red Wizard, and White Wizard they get the job done in 1 round easily. Ever been through the Temple of Fiends? You need every thing you've got and thanks to my Knight's white magic I had a few extra cures after Tiamat which most likely helped me beat the game my first time. Sure the Ninja can use TMPR and FAST which I kind of liked having against Warmech but give a Knight the power gauntlet and have a Black Wizard use Fast and you've got all the power you'll need so why bother wasting rounds on your Ninja unless he's hella strong? If you give your Knight items like the White Shirt his uses are even greater then before, making him versatile but yes. His biggest strength is his power and sometimes that's just what you need.