I developed KeenWrite[1] to make using variables in documents trivial[2]. My editor has no search and replace function. For my sci-fi novel, there's a variable {{location.protagonist.tertiary.Type}} that has the value "Bavarian Village". I could change this to "apartment" and every instance throughout the document prose and reference diagrams would update automatically and contextually. My typical example for explaining the use case is changing the name "May" to "June", but flat/apartment is hilarious.

[1]: https://github.com/DaveJarvis/keenwrite

[2]: https://youtu.be/CFCqe3A5dFg?list=PLB-WIt1cZYLm1MMx2FBG9KWzP...