Hazard strikes a ball better, has more pace and far more vision/intelligence. To put it down to a few extra fitness sessions and a bit more mental application is ridiculous, even by your standards.
Great players like Hazard have no discernible weaknesses and if they do, they work on them and turn them into strengths. I love watching Hatem but you can't compare his ability to Hazard's. Different leagues.
I still find it staggering, tbh. The last game I went to was the 2013 0-3 against Sunlun and after FT the one guy who was shouting for Pardew's head nearly got assaulted.