I care because it increases the cost of the device, increases electrical consumption in operating the device (again, costing more money), generates extra heat which shortens the lifespan of the electronics, creates possible failure points which could cause electrical shorts/interference with other parts of the device. Then there's the software aspect, bugs which require patching, "features" which can't be turned off, slowness in turning the device on and off, advertising when no signal is present, etc.
I want my devices to be smart, not my displays. I want my displays to be interoperable through several generations of devices.