Because spamming normal attack is lame and boring. I'd rather it just be automated like every other MMO. And just because a game has auto attack, or someone else wants auto attack doesn't make them lazy. Auto attack doesn't necessarily mean you will be pushing any less buttons, just the buttons you will be pushing will be for other things like more special attacks and abilities. Combat in general will have to be redesigned to make it work, but I personally find it better.