No map marker. No fast travel.
Those should not be bound to "hardcoe mode" but be a option in the menus. Similarly mini map should be selectable. Fast travel should be optional to the user but aided better with aids how you should find your target location.
For this they should look at how "Arcania" did it, you have tons of HUD and game elements you can freely activate or deactivate including "quest markers".
Quest givers are vague and sometimes wrong.
Sometimes wrong possibly but it should not just make it "harder to find anything". I played a mod a while ago that did just that mistake, no map markers but the same time leaving hints where you have to go so vague they might as well be nonexistent including not writing down vital info in the journal and keeping it to conversations only which where NOT REPEATABLE.
No-one can repair any of your things.
That doesn't really make ANY sense.
Diseases don't have little markers saying you have contracted it and it doesn't say what it is under the stat menu,you have to look at the symptoms and treat with the right herb. Horses must be fed.
With those I agree.
Also diseases should NOT jsut pop up and be there, they should have a incubation time and even when they break out don't be a full WHAM and there but slowly get worse.
A little side not, hardcoe mode should NOT mean "Just make everything HARDER" it should mean "make it m ore COMPLEX but still rewarding". As mentioned before, eating should be in but as a reward gives you natural regeneration which you wouldn't have under normal gameplay.