I think he's reasoning the same way as I go about seal fate now and then. While 100% is always better than 66%, 66% basically means "you can be fairly certain that it happens". Which gives the effect a "slight chance to fail". Which is exactly what it's like with pretty much all your attacks and abilities, for every class. The thing is, if you can spend that last point somewhere else, 66% is reliable enough. Also, 66% is quite near to the 75% is used to be. And we've managed to live with that one for years; why wouldn't we be able to do so now?
For comparison, think of seal fate 4/5 or 5/5. 80% is already so reliable you barely need the last point.
(And yes, I realize nobody specs 4/5 seal fate.)
Edit: Before I get yelled at; yes, I also realize Theo might have a completely different story, but this is an 'argument' I could put up.
Edited, Sep 17th 2008 5:35pm by Mozared