Minecraft at its base form isn't meant to be an ultra hardcore survival experience. It's meant to be open and inviting to casual players too. Adding all these difficulty increases and additional complexity would alienate the younger playerbase, the casual playerbase, and even some of the more hardcore players if there's no options to disable the additions.
There's a reason that mods are one of Minecraft's biggest strengths. They give you options, without forcing potentially unwanted features in your face.