Board Thread:Speculation House/@comment-27404492-20170511131216/@comment-27144409-20170617180853

Then they become very ineffective. Part of the point of summons is to have a "meat" shield to take the hits for you. If that damage is transfered over to you, suddenly a major factor in their appeal is gone.

Summons already (appear) have two limitations when it comes to Weiss. They appear have a high Aura cost, and they have been pretty difficult for Weiss. There's also the facts that things are escalating, and other characters have been shown as having grown stronger.