The biggest purpose of wing-body fusion is not to improve the overall lift, but to minimize the folding angle of the fuselage joint, thus reducing the radar reflection surface of the fuselage, which is commonly called stealth. This is only needed by military aircraft, and civilian aircraft do not need or use it at all.

Aircraft stealth technology includes two aspects, one is stealth material technology, the other is stealth structure technology. Wing-body fusion belongs to the second type.

The adoption of wing-body fusion technology in civil aircraft not only increases the manufacturing difficulty and cost, but also is not conducive to flight safety.