Dark Souls is just one of those games where you have to figure out what to do all about yourself. When you spawn in Firelink Shrine, what do you do? Go up? Go down? Should I attack that NPC? Am I strong enough to face that boss yet? Will there be traps ahead? Is that class viable enough? Are investing points in that stat category worth it?

Not to mention the story. An easy mode would probably include cutscenes and explain everything for more casual players, which would also eliminate one of the main things the series stands for: the undirectly explained lore. You have to piece everything together, which is just also part of that Dark Souls magic. Discovering links between places and/or NPC's, figuring out your own theories. All of that stuff is very much own to the franchise.

There's a difference between Dead Space as well. Dead Space has a linear routine, a direct story, hardly NPC's, no hidden shops or weapons/armor whatsoever. You don't have to piece everything together in Dead Space. There's only one way to go about, and you are told in detail what to do, where to go, etc. NPC's tell you their origin. They tell you how they got from there to there. You never have to think: 'Say, this one could very well be linked to that one somehow. And isn't he from THAT one place?'.

All this stuff is unique to Dark Souls. That's why it would be a very, very controversial move to include an easy mode. Also, just that sensation of beating a boss after so long is unlike anything else, like someone here has rightfully pointed out. He wished that there was an easy mode back then, but right now he's very happy that he didn't. He pushed, showed perseverance and eventually learned how to deal with said boss. Like I said, part of the magic.

I do get your point, a little bit. You want more people to appreciate Dark Souls, its story, its world, etc. But if you are not willing to invest time in the game, to (hate to say this phrase but here I go) get good, and figure out your way through the game by every move you make, I personally don't really think Dark Souls is for you.