I think what we are seeing here is that normal users and techies not primarily into VR, like this GizmoSlip guy, are less critical about the flaws they see because they are impressed/overwhelmed by the resolution and FOV improvements, and do not notice the details so quickly.
On the other side you have the Ben Lang kind of reviewers, experts on VR, who are pretty critical, because they only are interested if it offers a better experience than the existing VR HMDs and they do look for all the flaws, because that is what we expect from them - to tell us, what we might miss in a 10 minute demo but would start to notice at home, only after having purchased the product.
And remember that a company will always select their demos to show their products from their best side. We still do not know how the high contrast performance in games like Elite will be with highly lit, fast-paced space ships moving in front of the black void, ReVive compability, framerate stability, etc. etc.. There is still so much we do not really understand as long as they have not handed out their prototype/product to somebody who can take 2-3 days to thoroughly test it and compare it to the existing VR HMDs, and also see which flaws you ignore after a while and which ones start to be magnified more and more, the longer you use the product.
I am curious when we will hear from Pimax about their conclusions from the CES show and the schedule for sending the units to the selected beta testers. However, given the amount of issues I can see that they need a coouple of days more to make a thorough assessment of where they stand today, and when it makes sense to enter the beta testing stage. Sending out the V5 without clear improvements on some of the issues will not really achieve much.