The primary issue is that Pimax set expectations for December 2017 delivery, then last minute as KS started nudged that to January. So people are right to be annoyed at what was essentially either a massive misjudgment or just enticing BS to get people backing on KS.
However we (potentially) know the general status of the HMD, we know roughly where its up to and current expectations look a bit more realistic. Projects of all forms can easily move a couple of weeks or months for unforeseen reasons, something totally of of their control like a third party supplier/manufacturer let them down.
Given the fact we know the headset appears to be on track, and the fact this isn't a pre-order! This was a Kickstarter to help fund pimax in getting the 8K developed and released. I don't understand the idea that people want them to just rush out something that doesn't work well? irrelevant of levels of patience.. I'm sure the majority want a decent VR system that granted like all will have compromises but be a 'good enough' product to meet our expectations of now.
It's not like they are making bird houses, something with an obvious design and just dragging their heals for no apparent reason. They are pioneering something that doesn't exist elsewhere, and that needs time and effort. I believe its close, and yes if it gets delayed by a few months I'll be annoyed but certainly still wouldn't want something unfinished and substandard to be rushed out.
All we can ask for is improved feedback and transparency from Pimax, that's what we need right now. Its getting a little better but as a backer still not where I'd like it to be.