Code like this actually always makes me feel better about my own code when I’ve ultimately had to make a trade off between abstraction/organization and performa

Code like this actually always makes me feel better about my own code when I’ve ultimately had to make a trade off between abstraction/organization and performance. I wonder who all these engineers are that see code like this, especially in hot paths, and can’t understand how it came to be and that there was a deliberate choice made.