Right -- and that I don't agree with. My concern is laws that make it illegal to modify products you own or to offer advice or tools to people who wish to modify products they own. Similarly, arrangements like leases and limited licenses that convey some aspects of "ownership" but not complete ownership should also be severely restricted.
In general if there are no legal recourses to go after people who modify their devices, then it makes it more appealing for manufacturers to allow a supported opt-out method because that reduces the incentives to compromise their products with out-of-band methods.
So I'd prefer to take an indirect route of empowering customers rather than requiring manufacturers to do additional work to free up their products.