Personally I think the point of self destruct, for a structure, is generally to have it gone from the map to release the land it occupies. Having self-destruct leave a dead structure seems like pointless micromanagement, or if eventually reclaiming is automatic, still a hindrance and delay to the build process. If I really wanted to reclaim, I'd do so before the self destruct.
If the reclaim works similar to SupCom you would self destruct prior to reclaiming is a good idea because if you don't the Fabber ahas to 'kill' the reclaim target before you can suck up the wreckage. Mike