To be honest, in hardware you have absolutely no idea whether your components use some non-free firmware inside, and they sit everywhere these days: battery cha

To be honest, in hardware you have absolutely no idea whether your components use some non-free firmware inside, and they sit everywhere these days: battery charging controllers, accelerometers, SD cards, even USB-C cables. You can't even be sure that the blob is not updatable either - at best you can only know that the update process is not documented. You simply have to put the line somewhere, and while you can argue whether the place FSF puts their line on is correct, you can't really take the idealistic "no blobs whatsoever" stance there - it just doesn't work this way. Even FSF, of all organizations, is not doing that, and that should be already telling ;)