There's also a difference between "easy to aim" and "accurate". A crossbow could easily be easier to aim, meaning it takes less skill to hit a target, while a bow could be more accurate, meaning it can hit a target more accurately and reliably assuming you're very well trained in it's use.

So essentially if you had two random schmoes one with a crossbow and one with a bow, the crossbowman would be more accurate than the bowman, but if you then took a master bowman and a master crossbowman and gave them their respective weapons, the bowman might be more accurate than the crossbowman.

In game terms, the bow would have a steeper learning curve but a higher skill ceiling, meaning you start out bad at it but can get really good, whereas a crossbow has a shallow learning curve and a low skill ceiling, meaning you start out OK and can only get a bit better.

This is only a theory, but it would explain the varying reports on accuracy.