Hi mat, I don't think there is a resource page that's up to date for that but yes at some point Blender improved it's OBJ importer quite a bit and so you can just use its standard OBJ importer rather than installing any custom import plugin anymore.

For going from Blender into MoI, that's normal that you would not be able to do that since Blender will be exporting a polygon mesh file and MoI works with NURBS surface data and not polygon data. So normally once you are working with polygon data you won't be importing that data back into MoI.

The exception is that if you are working with sub-d smoothed polygon objects. In that case there is a new importer in V4 that you can use to import it and it will convert it to NURBS surfaces. You can find that on the MoI side pane under SubD > Create > "From file".

But if you have a file that you expect should work going from Blender into MoI can you please post it here so I can take a look?

- Michael