1. I don't think "engineering" is the correct word. It's more "design"
2. The finest design possible, unless properly executed, will be crap.
3. The finest design possible, properly executed with crap materials will be....crap
4. A less than perfect design, properly executed with reasonable materials will, 99% of the time, be indistinguishable (in terms of smoking pleasure) from the "perfect". For empirical proof of this, just review the number of posts telling us all how wonderful this or that pipe is, even with the imperfections.
Moral of the story....it's all absolute hooey, but if you like theorizing and "what-iffing" then knock yourself out.
The rest is just window dressing.