Startups are hard because the founders/wannabe founders who perceive it that way far outnumber those who don't. In a way, it's similar to getting better (expert) at anything. It is hard for 80% of people does not mean it is hard for a given person. It's a matter of several factors (and luck) if something hard for many people is not so for you.

Perhaps doing a company is more in line with "wealth creation promise" than say getting better at music or chess or anything at all. And that's why startups being hard gets a special mention in the landscape of hard things?