This is like the disappearance of removable batteries from nearly all modern smartphones (aside from a tiny number of low-performance models like the Nokia C20)

This is like the disappearance of removable batteries from nearly all modern smartphones (aside from a tiny number of low-performance models like the Nokia C20) on the false pretext that making phones impossible to ever truly power off is a tradeoff that gets us slightly thinner devices. There is no good, non-handwave-y (e.g. tiny additional BOM cost, tiny additional complexity for the firmware and plastic molds for the case) reason for IoT device manufacturers not including physical on-off switches for the devices' onboard radios.