Not picking sides here, but if you read the build threads on the H9 Corsair the motors did not exceed the mfg. recomended sizes.
My first plane was/is the H9 P-51 PTS. And it did have several issues which I corrected thanks to the people here at this board. Should I have had to done that? No. But I being a new guy to the hobby I am glad that I did. It gave me a much greater understanding on the ins/outs of putting a plane together.

And also if I am not mistaken, with the Corsair they have corrected the issue with the firewall and now the only problem is with the wings in the gull area just outside of the wheel wells. To me that says they are listening.
I am not sure how there assembly line is set up or what forms of tooling they use to make these planes. But I do know it takes time to re-tool and change an entire assembly line. And while all those changes are going on, they still have to produce a product to sell. So now you have a few thousand planes out there with a defect. One would think they would post a tech update on there website, but then something like that has the potential of scaring away prospective buyers. The business world is a dog eat dog world, and one has to be extremely careful with the way the handle themselves. Do I like it? No, Can I see both sides of the coin? Yes