I already plan to write a review for a German site, promised to a couple of people impatient to see what the 8K is capable of.
Nevertheless: In my personal environment, interest in VR is very conservative and manageable: I just have 2-3 friends, who are interested to see a demonstration, and none of them tends to be a blogger anywhere. Well, and my wife and my son certainly will try it once, but for sure, they won't tell or post anything to anybody anywhere since there is nobody who would be interested in that (my son is 8 yrs old).
So, of course, I'd like to share my experience with others in the internet. But I am not as ambitious as to be one of the first neither would I risk to break any NDA for that. My only purpose is: The HMD itself from hardware side is ready, I was able to get the 4K work with a much "worse" software the 8K will have already probably, and I'd like to play my games in 8K-VR first of all for myself and not for 15 minutes of fame on youtube...
Therefore, both Pimax and I (and @sjefdeklerk and others) could benefit from such NDA-agreements, as mentioned already by others: Trusted backers could play and test, and Pimax would receive more experience information in return.
I don't care about the first half an hour till the 8K is installed... as long as it works then as intended. Furthermore, I am certainly not a (semi-professional) modder - but I am willing to test it, try it, find work-arounds as I did with the 4K already. According my experience with the 4K, once everything is configured, I don't need to start the 8K-software everytime - I start SteamVR, play, enjoy and relax Nothing more, nothing less. If there's a problem, I'll share it with Pimax, look for solutions, and as soon as it works again or as the software or firmware gots improved by download, everything is fine for me.
I am certainly not so eager to publish the very first and most exclusive review of the 8K - there are much better and more professional people out there for that than me