new types of villagers

It occurs to me that a good idea to further expand the usefulness of villagers would be to add new types. That they are not only used to make trades. That some villagers can defend their own village, like the golem. That other villagers can build certain structures, for example that you have the structures of your village and can make several houses with the proper materials. The point is that it would give much more life to the villages if they were more autonomous (build their own houses, defend, collect their own materials, make their golems) for example the villagers harvest their crops, that is already an advance that the villagers be more self-sufficient. Thank you for reading.