Your forgetting that killing in battlefield is a two way experience. Whatever makes it harder for one person in that equation, makes it easier for another.
No spotting makes it harder for the person doing the hunting, but easier for the person laying down with a gun pointing at a door.
Only needing a couple of bullets to kill makes it harder to survive, but easier to kill for those with poor aim.
No minimap makes it harder for the person hunting, but easier for the person camping in the same spot.
In the examples you've given above, it makes it easier for those who camp, have poor aim and use lame tactics. As a result it attracts those type of people. Not saying that everybody who plays hardcore is the sort to camp in doorway, but the game mode makes it easier for them.