Bethesda is doing everything possible to make each Sole Survivor play play very differently based on Special Stats and perks.
The replay value of Fallout 4 looks to be through the roof.
Why would they remove the option to make the game more challenging?
The Fallout 3 FWE - FO3 Wanderers Edition has 20K endorsemants, over a million downloads, and is rated number six at Fallout 3 Nexus.
The FONV Mod Project Nevada has 52K endorsemants, over a million downloads, and is rated number one at Fallout New Vegas Nexus.
One of the main things both of them do is let you fine tune the difficulty level.
How hardcoe, how much loot, how often creatures respawn, and so on.
I think it is proven that Bethesda is looking at the best and most popular mods and pulling them in to Fallout 4.
I don't see how they could leave out hardcoe mod.
Or at least not give us a lot more options to adjust the difficulty level.