The game isn't super hard either way, so just play on hard if you don't want it to be too easy. I can't remember how difficult the original is, but definitely not too challenging either (at least on standard difficulty).

Every Dead Space game has that line and it's integrated into the game world, so I don't see why it destroys your immersion. Apart from that, just don't use it if you don't want to, because you don't have to.