Ammo crafting was a loving nuisance, especially as you found more ammo than you can craft.
Hardcore mode was alright but nothing amazing, just some more stuff to micromanage which was super easy (only sleep was kind of annoying if no beds around, but you could just chug nuka-colas all game and never sleep, so it still wasn't realistic). Plus they then roostered up by giving you a bottomless canteen in GRA (or other pack), which you chugged automatically, and had no rads, when half the point was balancing food/water intake against rad gain.
Also, NV had essential npcs too, particularly companions (unless on hardcore).