From the File-35B's case the justification is the fact that a standard takeoff ramp remains to be expected for useful functions, but a simpler and even more compact vertical Restoration can be employed. Actual operational practice might dictate outright STOL operation for being preferable. But when I watch the video https://zanderchmr40639.hyperionwiki.com/731937/skladací_stôl_praktické_riešenie_pre_každú_príležitosť