Such mentality is half of the problem. Maybe it won't take away much when watching archetype shounen like HxH, but with even a bit more complicated stories you have to draw conclusions based also on what is not presented directly, without crying foul the first moment you thought something unexplained happened. It's not like some committee was supervising that every detail must be explained even in shounen, it just normally happens to be so (for ill effects).
So, in short, the manga didn't really add anything essential that couldn't have been derived from the anime as well. Plus the anime had better translations.