If you practice test-driven development, the mindset is slightly different.

Humans can't think of everything all the time - TDD guides you to think about one thing at a time.

No one is sitting there adding a disabled prop on their component that then disables an input for no reason. You had intent when writing it. It's possible that a co-worker distracted you, or you went for a break, or you went down another rabbit hole, and ended up skipping disabling the input based on the prop.

If you're practicing TDD, you would have written a failing test before creating the disabled prop. That test will continue to fail until the productive code has been written. It helps to protect against those thinking errors in the first place.