Perhaps you should do some more reading by Jewish scholars on the matter.
When the Talmud was written, we could not keep people alive beyond their normal life cycle. You could not pump air into lungs and feed unconscious people. You could not force someone who no longer wants to live, to live.
Slippery slope arguments are always used by people who can’t otherwise justify their current position, and people who live in a fearful and paranoid state.
Your argument is a slippery slope towards moral relativism and 'anything goes' thought.