The art of Dark Souls is *deeply* intertwined in the world being unforgiving, uncaring, and hopelessly doomed. If you were running around like Dante just slapping everything silly without a care in the world, the art wouldn't have the same impact. Making the gameplay easier, would have a negative effect on the art's presentation and the themes and moods that they give to the player. All the Hollows are, to be simplified, just "other players" that have given up. Seeing the world ruined by what used to be regular (well, as regular as it gets in Dark Souls) people who fell into despair, gave up, and Hollowed wouldn't have as much of an effect if the oppressing world wasn't making the player think about giving up. Realizing that Hollows are just Undead, just like the player, who have given up, just as the player has thought of doing so many times, lends extra weight to their presence.
And no, it's not impossible. You don't have to be "good" at games to play it. But you do have to accept death, you do have to accept challenge, you do have to accept patience, and you do have to accept that the game doesn't give a flying fuck if you die 1000 times to the same boss.