Totally understand the need to for rough early imports. Even for those, it can still be worth setting up a system to join things. For example, I work with Rhino and have a script that takes everything on a layer and meshes/joins them into a single object. It might take a few minutes to run over a whole file while I go get a coffee. Its no good for things with texture mapping or light baking; the final product certainly needs a more careful consideration of what to join and how. But for the rough early imports I maybe don’t care so much, and it speeds things up so much with file count in unreal that its often worth the time.