>Almost every end user has at least one last-resort mitigation for any vulnerability: the power switch.

So if a hospital runs a life support on a vulnerable chip, they should just hit the power switch until it's fixed.

Or what about a computer controlling a nuclear power plant? An airplane? Spacecraft or Satellite?

Vulnerabilities don't restrict themselves to equipment that is non-essential for people to survive or would cost millions to replace in consequence of a hack or shutdown (please try to revive a sat after you did a full shutdown, I will be awaiting your report on how you'll align the antenna)