We do take cars that fail safety inspections off the road. You are correct, we don't hold them to higher standards, but that's not a reason why we also shouldn't remove genuine hazards off the roads.
If a car is far more likely to kill someone, it shouldn't be on public roads either. Just like devices that can't be update don't belong on public nets. The risk to the broader public is to big IMO.
The risk of taking down large portions of the internet has the same risks as a vacuum? Interesting.
Your right not every device has parts availability. But again, why not? Because it it'll cost more?
Your willing to risk tanking the digital economy for what has historically been huge sums of money, because we don't hold vacuum cleaners to higher standards?
I'm being obtuse, but you keep pointing to "well we don't fix that problem over there, so we shouldn't do it over here". It doesn't sway me. We should absolutely fix repability of ALL ELECRONTICS AND CRITICAL INFRASTRUCTURE