I'll keep this short as I don't have time to find the necessary links.
First and foremost, I NEVER......EVER mentioned knockoffs. Not once. That's an apples and dinosaurs comparison to an open mold frame. Knockoffs are just that. Open molds can actually be found with name brand paint on them and called something else.
Now, simple googling will yield many articles about companies like Merida etc that manufacture big name brands right next to open mold frames that are often times re-branded by lower level brands. Sometimes many times over.
There are very few factories over all in Tiawan and China that can produce these. It just so happens they produce for almost everyone.
Related note: the ONLY defective issue I've ever experienced with carbon cycling parts is actually with an ENVE 45 wheel that had a bladder issue causing a fracture in the brake track. Found that out at 50mph on a 12% descent. Those are made right here in Utah, btw.
It took me awhile to realize this as a reformed gear junky, but you're paying hundreds of percent markup most of the time, just for a paint job that makes you feel good because it has a brand name attached to it.
What about the warranty you ask? Both ENVE and Zipp (hub issue on a 3 month old 404 firecrest) have said "nah" to obvious warranty issues.
No one thus far, specifically relating to your original points, has debated whether some factories make several different brands' bikes, since most who know the industry know that to be a fact. But in your mind, how many factories is a few? 2? 5? 20?
You have yet to address my previous questions. Are you SURE, that EVERYTHING that comes out of your open molds are technically equal, or even really safe, when compared to the overpriced name brand bikes to which your refer?
I think you might be surprised that there are many more small shops than you can imagine, with the ideas and ambition to obtain molds and get into the bike making business. Some might be safe, but my wager is that's highly unlikely based on the ones I've seen and my knowledge of the level of expertise many of these shops have.
By the way, your very definition of frames which are open mold, yet are also sold as name brand frames, is exactly what a knockoff is.
Once you have a "company", with a distribution, office, and the other things that go along with that, it then becomes a different entity with a different business structure and it's inherent responsibilities, i.e insurance, proper testing and subsequent assurances of a "reasonably" safe structure for a frame or fork.
I could build a bike out of balsa wood, to such a state that it would go down a hill at your 50 mph, and not have any failures or handling issues. Throw that unexpected bump, rock, obstacle, or "stress" into the equation (or hundreds of thousands of cycles of minor impact or twisting force), and my balsa bike could explode and leave me on my face.
I am all for saving money, as I'm sure most here are. I would absolutely love to be able to buy a frameset for $500 or $700, or whatever comparatively low price and still be reasonably sure that it was equally as safe/stiff/comfortable/light as a big name brand frame.
I'll make it easy for you...
Unless you have been to every one of the open mold shops, even to the shop which made your FM066, and know enough about fibers/layup/mfr processes and have seen their testing protocols, then you really DON'T know just how safe your or any other open mold really is.
You only know that it hasn't failed on you yet.
You insulting others who buy "$4000 paint jobs", slamming Zipp for not covering an "obvious" warranty issue with a hub, isn't addressing the specific questions I posed to you. (except that you ride one, beat the sh t out of it, and it's so)
"Haha, this is STILL the ruling train of thought to the average cyclist? Christ...."
Maybe starting your post like that might have been a bit inflammatory?
Apologies to the OP, no more derailing this thread for me.
Back on topic, the diamondback you refer to looks like a very nice bike and has some nice design cues. Make sure you will be able to get adequate saddle/bar drop as the DB has a longish head tube length to frame size number, plus add the headset cap, 20mm.
My top nod for underpriced, uncommon, but pro tour, is the latest canyon ultimate CF slx. It's up to 50% less expensive than some comparable or arguably inferior name brands new, and in my opinion, an incredible deal now as a new bike. Looks as if it would only be about $500 more for the frameset than the DB. The dollar/gram (since this is WW, roughly 250g frame/fork difference on a given size?) result comparing to the DB could justify the price difference for you....maybe?