My guess is that this is how the body actually works.
At the chemical level, the human body has many highly individually specific things (like enzymes and receptors).
However, at the system level, it's probably easier to take two slightly specific things and combine them to make something that is specific enough but not too brittle.
Some people have been working on combining two (or more) factors in order to only activate when in the right spot: https://www.science.org/content/blog-post/two-steps-activati...
My guess is that this is how the body actually works.
At the chemical level, the human body has many highly individually specific things (like enzymes and receptors).
However, at the system level, it's probably easier to take two slightly specific things and combine them to make something that is specific enough but not too brittle.