carbon forks have a limit of what weight to put on them (loading wise) My bike has a carbon fork, with rack eyelets and mounting hole for rack and I have been told different amounts by diff people for total weight allowed (10 lbs by bike store) so in the end, I am not sure what to believe and will look into it more clearly when I actually get around to putting bags and rack on the front.
and yes, a carbon fork will always have some possible issues like if after a collision or mishandling, its hard to know if structural damage has occurred. Before getting this bike, I thought of the possbile downsides to a carbon fork and in the end didnt allow the possibilities of negative issues to override the slim chances of stuff happening. I guess if you are really rough with your bike, perhaps a steel fork would make you feel better, but carbon forks are very much common nowadays, so unless a thalydamide or asbestos sort of thing happens, they are likely to be around more and more.