Its impossible to do with anything that gets updates. You never know what the next update will bring. Obviously things that connect to the internet and do not get updates are hopelessly insecure. its also pointless for anything controlled by an app through a server (anything from cars to fridges these days) as you cannot control what the server does.

Governments will also find excuses not to do this as its expensive and inflationary. They will play down the risk, point out the Americans can do it too, etc.