However, that does not mean you will get an open device now. When was the hardware openness so important, that it played a major role in purchase decision at statistically significant rate?
For 99,999% of people, it doesn't. They want an appliance that works out of the box, without bothering with alternate firmwares. So that's what they are getting.
There's no motivation to put UEFI and PCI into the hardware, just like there wasn't 10-15-20 years ago, when the first designs were made.