I'd love if we could trust most devices to be publicly exposed, but IMHO we can not. If router manufacturers could be trusted one could add all kinds of clever things there, but ...
This is not true. Most real world attacks I've seen begin by infiltrating malware via the web, e-mail, social media, or phishing. Once inside existing connections between existing internal systems are exploited to crawl around the network.
Remote attacks against non-DMZ things are fairly rare in practice.
The only way to stop this is to implement even more firewalling inside the network, which basically breaks LAN.
I very much agree with the parent and have been talking about Google's beyondcorp and deperimeterization for years. A device that can't be safely connected to a network is broken, and we should stop degrading our networks to support broken junk. If broken junk gets hacked, it is the fault of the makers of that broken junk.
It is not hopeless. I've been into this stuff since the mid-1990s and things have improved a lot since then. I would not be too afraid to hook up a Mac or a fully patched Windows 10 machine to the public Internet. In the 90s or early 2000s I would not even consider this. You'd get owned by a bot within an hour. I remember in 2000 hooking a virgin Windows machine up to a campus network and being able to watch it get infected within 5 minutes.
The trends for the future are positive. Safer languages like Go, Rust, Swift, etc. are getting more popular everywhere. Advances in OS security like W^X, ASLR, etc. are getting ubiquitous. Local app sandboxing and containerization is a thing almost everywhere. Devices security postures are improving.