At nearly 16000 feet high, one does not just zip up from Paris, sprint up it and have no problems (some people do, of course, but I also watched people basically puke their way up).
Even though the route is easy for an experienced person, there are many objective dangers that one needs to be able to recognize and deal with appropriately. The summit ridge, while not hard, is very exposed. Good crampon and ice axe technique is necessary. Conditions can change to dangerously bad in a matter of minutes - again experience is needed to deal with that.