Nobody will get there pocket computer later because one or two people…
If I wanted to nitpick, I could correct you and say that these one or two people will shift others backward, and there is always somebody on borderline affected, like some of those people who were between the original backers in the end of September '17/start of October '18 
As I wrote before, facts accessible to me indicate that Purism is slightly favoring some (looks like few) people over others. In the good old times (pre-COVID) such a behaviour might have been hardly noticed, or explained away really well; but if you add the general angst of these times on top of the generalized supply chain problems onto Purisms erratic (biased?) communication, such things obviously get way more resonance.
Surely there are reasons. Without reasons no dog wags his tail.
I don’t know of an official statement of any; and personally… I don’t care for them.
My target is to get a fully functional phone, as it was promised, and in reasonable times. It needs many steps to get there, and facts show many such steps have already been taken against any misplanning, overly optimistic promises, problematic communication, supply disruptions, and whatelsenot - with determination, work and goodwill of many people involved.
Still, in my personal evaluation the probability of not getting anything and having to write off the loss has been nonzero quite for a while and is rising every day. 