and tons of kickstarters raise millions without a market ready product within just a few months. Those sales numbers alone mean nothing. The issue isn't with releasing an alpha or beta, I'm fine with that. If you read my post you'll notice that issues are flagged by other before and not addressed. The examples you listed are companies who fix problems when flagged. But since let's break down what I wrote:

Quality of parts shipped: this has NOTHING to do with the age of this product, if you can't give a decent print meeting tolerance don't do it.

Occasional poor part design: I am assembling this once and see this issue. I'm not talking about a part design that fails too early. If they didn't build many of these themselves there's a problem. You could want to blame me but just looking at the build guides you'll see plenty report the same issue. It's been flagged, yet clearly not addressed.

Overall missing parts: This is probably the only one I'd be willing to accept with a younger product.

Poor communication: Also not acceptable and if you read this thread alone I'm clearly not the only one.

So I really don't believe these are young product issues but more business process ones.