The body is complex.
We don't understand it perfectly, but we can make increasingly educated guesses.
More specifically, we can try to understand what the body's made of (anatomy), and how it works (physiology). Once upon a time, these were considered so separate that surgeons and physicians had nothing to do with each other.
How might this change? And how can we give ourselves the most options?
An ideal treatment (1) permanently and (2) instantly fixes pathology in a way that's (3) completely non-invasive, and (4) has zero adverse effects. This is probably impossible, but we can make different tradeoffs to attack the problem.
Anatomical interventions (like an operation) are fast, but also invasive, and tend to have front-loaded adverse effects.
Physiological interventions (like medication) are often slower, with risk of longer-term side effects, but can provide ongoing, non-invasive benefits.
How to balance the two?