The person replacing you needs permission to find a better method.

Handing over work carries an unspoken hope that it will keep being done exactly as you did it, since that would prove you were right. Methods are shaped by a particular person and moment, though, and what you built around your own habits may not suit anyone else’s. A successor who believes they must copy you inherits your constraints along with the task. Improvement afterwards is not a comment on you.

When you hand something on, describe what the work has to achieve and keep that separate from how you happened to achieve it. Then say directly that the method is theirs to change.