Saying

Reversibility (Two-Way Doors)

Some decisions are easy to undo. Some are not. Spend more time on the ones that are not.

How to use it. Ask "if this is wrong, how hard is it to back out". Two-way doors deserve speed: try it, learn, and change your mind. One-way doors deserve care, so get it right before you walk through.

How it gets misused. Used to justify rushing everything as "reversible". Most architectural choices, hiring decisions, and public commitments are one-way doors disguised as two-way ones.

Saying YAGNI (You Aren't Gonna Need It) Do not build features you might need someday.
Pattern Cost of Delay The economic value lost by waiting one more week to ship something. Often higher than the cost of doing it badly.
Saying Sunk Cost Fallacy What you have already spent is not a reason to keep going.

Reversibility (Two-Way Doors)

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