They discovered the problem. Waited long enough to see how extensive the problem was. After whatever investigation process there was, it was determined that they were just manufactured poorly. Design error or manufacturing error? More testing. Now that the true issue is understood, how to fix it. Iterate changes to make new replacement better than original design. Cool. Now, find a factory and get in their queue to manufacture the thing. Receive shipment via literal slow boat from China. Distribute parts, arrange repair mechanic appointments, etc.
I'm not defending the situation I find myself in, but if you honestly can't think of "what's taking so long", then I'd suggest you're just not trying at all. Maybe you have no experience manufacturing something, so that might be out of your wheel house. It's not like someone can just say 'git clone bicycle parts' or 'npm update bicycle parts'
If you can't, the reality is you didn't buy a bike, you bought a bicycle-shaped object with proprietary components designed for the landfill.
Overall, I'm quite happy with my bike. It does exactly what I wanted it to when I purchased it. However, it's the company itself that just seems to have it's head insert fully up their backside. It seems to be a Seattle thing, but I feel it would fit in perfectly inside the SV VC world of "disruptors" where a concept that is as ubiquitous as a bike gets updated to be the VC darling of a thing only to realize the updates are so stupid that it devalues the entire thing. Rather than using stock component parts, let's custom design everything!! What could go wrong?