A crossed-out plan gives change a record without requiring a dramatic explanation.

Crossing something out leaves both versions on the page. The plan you had is still legible, the new one sits beside it, and nobody needs a speech about why the first became wrong. That is a lighter way to change your mind than announcing a revision, and it keeps an honest record that a clean rewrite would hide. Most changes of direction are small and reasonable, and having to justify them spoils them.

Keep a plan somewhere you can amend in ink rather than replace. When something shifts, strike the line and write the new one under it, and let that be the whole explanation.