Hi Antidamage -
Have no fear, we have no intention of removing the single LOD importation setup. It may not be the best way to deal with LODs but we understand some have no other option.
I have reproduced your problem but currently this is a feature that is working as intended. As when you click the reimport option and not the LOD >> reimport LOD1, the engine is doing exactly what it is supposed to be doing. It is reading the FBX file and returning exactly what that file has told it to, so no LODs.
I can understand your frustration at this problem however and have entered a request to add a feature to reimport the Base mesh as an LOD and not as a whole FBX reimport.
Thank You
Eric Ketchum