"Could be. I'm a pretty dangerous dude when I'm cornered." "Yeah," said the voice from under the table, "you go to pieces so fast people get hit by the shrapnel."
"For now. But if I ever decide you're useless, you are a dead man." To be killed by you is to be desired more than a life excluded from your service." Bravo." Her Imperial Viciousness laughed with genuine feeling. "Bra-vo!"
She wanted to get some personal profit out of things, and she rejected as useless all that did not contribute to the immediate desires of her heart, being of a temperament more sentimental than artistic, looking for emotions, not landscapes.
The only time they ever throw anything away is when it's really and truly broken, and then they make a big deal about it. They save up all their bent pins and broken sewing needles and once a year they do a whole memorial service for them, chanting and then sticking them into a block of tofu so they will have a nice soft place to rest. Jiko says that everything has a spirit, even if it is old and useless, and we must console and honor the things that have served us well.
For all that was happening to him, his voice was strong and inviting, and his mind was vibrating with a million thoughts. He was intent on proving that the word 'dying' was not synonymous with 'useless'.
A theory is like medicine (or government): often useless, sometimes necessary, always self-serving, and on occasion lethal. So it needs to be used with care, moderation and close adult supervision.