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If you find yourself wondering this, the answers are in an undergraduate economics course. Please learn the basics ;)

Certainly not because the developer didn't learn all the x86 machine code mnemonics by heart.

How is that relevant? A computer architecture class explains the high-level concepts of an ISA and micro-architecture, covering features from across the domain.

There is never a strong focus on x86, and any kind of rote memorization has nothing to do in a higher education institution.

Are you autistic or something? Serious question. You seem to have a hard time understanding other perspectives, and you missed obvious sarcasm/hyperbole there.

Because the developers are not using Chrome tools to profile their web apps, and they are not collecting performance metrics in production?