It forces the player to adapt, and adds long-term challenges into the game play.
Hardcore actually isn't that hard once you understand how it works. It makes combat, and every decision you make more interesting. It turns items that were useless in the normal game, into lifesaving treasures. It requires a lot of game knowledge, however. The mode adds just enough layers of depth to be challenging, while still feeling completely fair at the same time. Once I got into hardcore mode, it ruined normal Fallout for me. If you come across anything that needs fixing or is wrong, please comment and tell me so I can fix it! Also comment some tips if you wish!