User blog comment:Willbachbakal/(Champion Rework) Olaf, the Berserker/@comment-25228021-20150706141435/@comment-1330314-20150706145850

The global cooldown is mainly to pace Olaf to some degree, so that even when he's generating tons of Fury he's not acting like in URF mode and mindlessly spamming the same ability over and over. I'm definitely encouraging a fairly spammy playstyle here, but I also want Olaf to constantly be making a choice as to which ability he should spam at the right time, which a global cooldown would help with.