I think "blobs" is tricky terminology which might confuse - it confuses me. I prefer talking about 'firmware'. Firmware is stored in Read Only Memory (ROM) as a binary. It usually cannot be changed and it just meant to make the hardware work at all. The FSF says "Firmware that is installed during use is software; firmware that is delivered inside the device and can't be changed is software by nature, but we can treat it as if it were a circuit." This makes firmware closer, or even the same as, hardware. And while all hardware should have free designs, like Purism's, we don't have to reject non-free hardware the way we have to reject non-free software according to the FSF.