Hi SememeS,
The FBX importer being so deeply tied into the Editor modules right now is more of an artifact of history than a conscious design decision (at the time we weren’t thinking about editor extensibility nearly as much, etc…). We don’t have any short-term plans to refactor it right now, due to higher priorities for the tools team (UMG, Sequencer, etc…), but we would certainly consider taking a pull request that refactors FBX importing to reside in a separate Runtime module (and in general any work that heads towards making mesh importing pluggable, whether it be Developer or Runtime code).
If anyone is interested in working on , I can put them in touch with people who can guide the effort / review it.
Cheers,