Selector in group node

The group node lacks the ability to select one parameter from the list. For example, if there was a Switch node with the ability to connect several different types of data, for example, in shaders it is a color or an image, and in geometry nodes, it is an object, vector, etc., then we could create based on this node group with the ability to select one parameter from the list. What is it for? I have several images, for example a brick, concrete, tile and glass texture, and I want to select between them in a group node so that other users cannot see how the nodes in that group work.