How many things built into products have obsolete hardware or unused functionality that would have to be listed? I understand being reactionary to a microphone

How many things built into products have obsolete hardware or unused functionality that would have to be listed? I understand being reactionary to a microphone but where is the line? How do you draw it? Do I need to list all the capabilities of some SoC even if I don't take any advantage of them? If a component has thermal sensors I'm not using do I have to list every one of them on the box?