I’ll preface this with our current process. Our eng. team designs/builds our source files in CAD and then exports an .obj file for us to import into Blender. In the current 2.8 build when we import our .obj files blender merges the pre-separated meshes into one mesh layer. 2.79 doesn’t have this problem. Am I missing something on import with the new 2.8?
Right now as it stands our fix for this is to open the .obj in 2.79 and then save it as a .blend and then we open it in 2.8. This usually retains our layers, but as the updates start to pile up in the future I’d hate to always have an old copy of blender sitting in my app folder for conversion.