You have Normal Mode and you have hardcoe Mode. hardcoe mode, turned on at the beginning of the game and maintained all the way through to the end of the main game's main quest, gives the Achievement/Trophy and any other cool reward the devs can think of. Normal Mode is like Oblivion. Nothing hardcoe about it.
So why is my idea any different from anything else? Well, hardcoe Mode would include every hardcoe element the devs see fit to include. These would be locked in for the duration of the game. Normal mode would include ALL of the hardcoe options. So if you don't want full hardcoe, you can tick off the boxes for the hardcoe elements YOU want in YOUR game. Maybe you want to give food and drink a purpose, but you don't feel like being tethered to a sleep meter. Maybe you want to play the base game with a save-lock for when you die. Any combination of hardcoe mode you can include, and, if the devs decide to have "hardcoe Mode" not include all the hardcoe aspects (like save-lock upon death), assuming there's going to be a hardcoe mode in the first place, then Normal Mode is where you customize your hardcoe experience.
This allows the game to have more customization in terms of the direction of the game and how restrictive it is. It allows people who want a really unforgiving experience to have it, while still allowing people who want to play a couple hours a day and be able to save/reload at will to get through the whole game and enjoy it like that.
I really think the game needs a hardcoe mode, and I really think hardcoe would be a huge success with this level of customization. You can't make everyone happy all of the time, but in this aspect of the game, you can, and I think they should.
Thoughts?
EDIT: Keep Mod discussion out of this. Consoles don't get the benefit of mods, so that's not a valid solution to this idea.