> It's a rule of thumb that hasn't led me astray yet. How can you know if your decision is correct if you never use it in the first place. Isn't it like only i

> It's a rule of thumb that hasn't led me astray yet. How can you know if your decision is correct if you never use it in the first place. Isn't it like only implementing A version of A/B and concluding that not implementing B version was a good decision.