The blast radius question
Before you build or change anything, ask what breaks if it goes wrong. The answer should shape how carefully you proceed.
Not all changes carry the same risk, but teams often treat them as if they do — applying the same care to a cosmetic tweak as to a payment flow. The clarifying question is blast radius: if this goes wrong, what's the damage, and how far does it spread?
Risk is not uniform
A change to an internal label has a tiny blast radius — fix it and move on. A change to how money moves or data is deleted has a huge one. Matching your caution to the blast radius is how you move fast where it's safe and slow down where it isn't.
Contain the radius
Good design shrinks blast radius deliberately: gradual rollouts, reversibility, isolation so one failure can't cascade. When the radius is small, you can experiment freely. When it's large, you build in the safeguards before you ship.
Before any change, ask: if this is wrong, what breaks and how far does it spread? Then act accordingly.