What we see as "just bits" is a product of thousands of men, smarter and more skilled than both of us could ever hope to be - all working together to keep those bits of ours delightfully simple.

The unfortunate truth is, "bits" sit on a vast foundation of chemistry and physics pushed to their limits. It's a (mostly) deterministic subspace, carved carefully into the non-deterministic world with sheer effort and skill. This is why those fabs are so expensive and complex. Nature defied, reproducibly and at scale. Keeping the Crawling Chaos away one wafer at a time.

If one line is performing well, you can copy its parameters to another, as a starting point. It'll get you some of the way there. How far? Have fun with that. Those two lines, you see, are not the same exact line copied twice. The equipment is the same, but our "the same" is a short for "merely very similar". There are subtle differences. There always are. And some of them matter.