the problem with the wing tube being the spar and only spar is this wing is swept. without the outer spar being tied into the wing tube, there is the potential of wing flex and or flutter. if neither occur, there still is most likey an expiration date for this wing design just from repetive stress. especially the way we fly them hard. i like the lack of landing gear beef myself. also, worth noting, hard landings will shorten the life of this wing. just my thoughts, barry