Let's not conflate design and assembly. The design work is done. The design of the fan blade is done. The design of the Thunderbolt parts is done, and they are readily available in Macbooks. We are waiting on assembly. Is parts density on a Mac Pro circuit board so much higher than that on an iPhone that the Chinese cannot accomplish the task? I would be very surprised if the answer is yes. Owing to their precision, pick and place machines can populate very dense circuit boards. Unless the Mac Pro uses a completely different parts set for Thunderbolt, I see no evidence to suggest availability of Thunderbolt parts is an issue. Macbooks ship within 24 hours.
Your arguments relate strictly to design, not assembly. The design is done. We are waiting on assembly. Usually, when some piece of an Apple product is subject to low yield/supply problems, we see articles all over the web speculating about it. I've not seen this with any Mac Pro parts - other than possibly the CPU.
One last point, I'm not a China advocate, but if you think they are still building stuff by hand on dirt floors, brother you're in for a shock. I am inclined to suspect the difficulty in ramping Mac Pro production is evidence of this. I bet the Chinese could have produced more machines in less time.
1) MBPs don't use all the same parts as a Mac Pro.
2) you completely ignored manufacturing on your comments regarding design and assembly.
3) If had known your premise was to claim that Americans are lazy and stupid I wouldn't have engaged you.
4) Passing the baton.