This is why you learn how to install high-quality AI into your familiars, kids.
Seyrun isn't the USA Government, she won't pump resources at a mere tool that has little to no practical use for her. Also, a higher quality familair requires more mana to sustain and a soul to act on its own, thee are things Seyrun would like to avoid. Only her snake is well made like this, but mainly because it's a luxury pet, nothing more.
EDIT: If the familiars get broken, so be it, Seyrun can do more. I just don't like if it said destruction ,makes no sense. Also it's a pain to follow them forever, eventually Seyrun will stop using Familiars once she has a gist of how Fuyuki's Masters work.