At this level, I find the goolock's spells to be superior to the fiendlock's. But you're right. After level 5, fiendlocks get fireball. At 6, they get Dark One's Own Luck. What to goolocks get? Entropic Ward. A lackluster ability that will be made worse by BG3's reaction system. I have no clue how or if larian will implement goolock's 3rd level spells. They didn't give the phantasmal force. As for their missing level 1 ability? I hope they come up with something. Goolocks are gonna get shafted in the final release.