This was necessary for the resilience of the Meiji system - if the rights of the Seshu-Shinno-ke were accepted under the law, they could not have been easily rescinded, even as the blood line diverged from the reigning imperial line over the generations.
これは、一旦世襲親王家として定めると、世代を経て皇統との血縁関係が離れていっても容易にこれを解消することができず、弾力ある運用が難しくなるためである。