You shouldn't have to play the game on the hardest difficulty setting to make it a challenge. The whole point of a survival horror, and the name is the big giveaway, is that it's a challenge to survive right off the bat. Forcing you to play the game on the hardest difficulty setting before it's a proper survival horror game is ridiculous imo.
Lol, noone in the their right mind would only make the game accessible to anyone but the hardcore player...
Theres still nothing stopping you popping the disc in and playing on the hardest difficulty straight off the bat...You want a true survival horror, go and play any Dead Space game on the hardest setting and you'll get it...The only different between the difficulty levels in Dead Space are the health of the enemies and the amount of the ammo you find...Probably the 2 biggest elements of survival horror anyway.
You defeat the purpose of the genre if you want to be able to have no ammo, but still play the game on casual...It doesn't work like that...Wheres the "survival" element if you've got no ammo, but then you realise you don't need it because you're playing on casual and the enemies do barely any damage, and have little HP...You could get by on just melee alone...Lol
Hardcore mode is the truest reflection of survival horror....Knowing you get a limited amount of times to save your game, and also knowing that one wrong move could see you die and end up giving you an instant game over and no respawn...It has a more authenticated feel to it, and is always making you think carefully about your next move...It's more immersing and makes you think about what you might be doing in that situation more...
Players are always going to be more care-free knowing that death is inconsequential, so having a mode that actually makes you reflect more and care about what your characters next move is, is what brings the survival horror elements and makes them more profound.