That’s not really the same thing though because your ISP doesn’t gain a usable IP while you’re rebooting it.
The only way ISPs would, would be if their customers routinely turned their router off while they’re not using any electronic devices. But even the older generation I know (80+ years old, no “smart” devices apart from a Samsung tablet or a laptop, depending on the individual) don’t turn their routers off. It’s just not something people do.
In fact if anything, the kind of people who might want to are likely the same kind of people who would get scared to in case it broke something.
The only class of people I think who might, would be ultra tin foil hat paranoid people. And that’s certainly not going to be a large demographic.
So when was the last time you checked for patched-but-not-auto-applied vulnerabilities in your (almost certainly ISP-provided) router?
ISPs don't want things to randomly break for consumers, so are likely to avoid rolling out updates that could potentially go wrong, but all code has vulnerabilities, and this controls access to your internal network.
