Hi,
I may be alone in this, but I'm not sure I understand what you're asking. What do you mean by productivity solution?? Personally I'd love someone to do the work for me :p but I doubt that's the answer you're looking for. I don't mean to be blunt, but it seems like a rather vague term and if you're looking to help PhD candidates it might be more useful to ask if they would find the specific services/solutions you offer helpful. Similarly I'm unsure what you mean by productivity challenge. As for what people are afraid of, I'd like to think I'm not alone in saying failing the PhD is the root problem that keeps me awake at night. I think most PhD issues boil down to wanting to get it right so you don't fail.
I hope this allows you to provide a little more information, which might let us help you more.