The reduction in proprietary hardware that results from those systems is not meaningful in my view while the massive reduction in security and the greater inconvenience matter.
People have no idea how their hardware works. A card from NVIDIA has not just the NVIDIA drivers but a bunch of internal systems with additional firmware. Even your CPU may have an entire OS on it.
Hardware that allows its firmware to be updated is more open, not less, even if I currently only have proprietary firmware to load on it. And at least it can be updated. Simply not letting me upgrade the firmware does not magically make the hardware more open. Not allowing proprietary firmware for an open source operating system is just not an idea that resonates with me.
Would I prefer fully open source hardware and firmware? Yes. I am happy to see these options are slowly developing. In the meantime, we all run our software on proprietary hardware and drawing the line between hardware and software at a less convenient or less secure point is not making me any more free.
At least, that is my opinion man.