I don't deny that, but saying "PCs are totally libre" is vast overstretch. PCs are getting more and more complex, include high number or sub-systems, that are a

I don't deny that, but saying "PCs are totally libre" is vast overstretch. PCs are getting more and more complex, include high number or sub-systems, that are actually mini-computers themselves, so by installing an open-source OS on the topmost layer we only get an illusion of the open system. But unless we have an open hardware along with source code for firmware running on all those sub-systems, we can't call PCs "libre".