Disabling Vanilla Elements

I think a good feature for MCreator, would be the ability to remove vanilla elements like entities, dimensions, structures, blocks, or items. It would be very useful in mods like full game overhauls and nostalgia horror mods.

You would have to enable this feature in options, as it does have very catastrophic potential, But overall it can be very useful if used well. There would also have to be limits, like a maximum amount of items being removed or at least 1 dimension enabled, or else the game would be unplayable.

I understand that it would most likely be very hard to program, but it would be very appreciated.