I wonder if the categories are correct. Those are not Layout items. I would either have them in Group or in Input/Output categories. For the records, for shaders the Material Output is in the output category.

Also another option is for the poll function to only let you create the nodes if there is no node of its type there.

I agree with Dalai here that they should be under Input and Output respectively.

Currently, having more than one Group Output node disables the whole tree. Could it be made to only use the active Group Output node, like Material Output does?

In D10241#260232, @Pablo Vazquez (pablovazquez) wrote:

I agree with Dalai here that they should be under Input and Output respectively.

To be clear, we have no "Output" category in geometry nodes right now, are you suggesting adding one?

Currently, having more than one Group Output node disables the whole tree. Could it be made to only use the active Group Output node, like Material Output does?

I think this situation is a bit different, since these are just node groups. We could add the idea of an active node group output, but as far as I know we had some different designs for how node groups could be improved already.

I talked to @Hans Goudey (HooglyBoogly) and we both think it could be in Group. @Pablo Vazquez (pablovazquez) do you have any big objection with that? I personally find a bit strange to have the Output category that we won't really be using much

Let's go with adding these into the Group category.

These nodes should be moved from Input/Output to Group for Shading, Texture, and Compositor nodes as well.