This metaphor I remember and it's a good one - ultimately, "spicy food" is as subjective as is difficulty, none of us eat the same food, and we never read the same book or watch the same movie, but here it is even more pronounced. Back home, I sometimes order spicy food and enjoy it. When I travelled in Asia, I always made sure to tell I need "no spicy" food, and still sometimes got very spicy one, with people sincerely surprised that I even think it's spicy. For them, it's not. And I were to order actual spicy food, I wouldn't be able to eat or feel any taste at all, only burning sensation.
Some people won't be challenged by From's games at all, for others it's impossible challenge, we all have different experiences, neurological make up, physical limitation and the like. So ultimately "one challenge for all" is impossible. It is also the reason why many tutorial options are better than 'easy mode", because this easy mode might not address person's problem at all.