I like the F91W because it refuses to die, keeps good time, has as an alarm and a hour minder. However, to repurpose it into some kind of frankenwatch to behave

I like the F91W because it refuses to die, keeps good time, has as an alarm and a hour minder. However, to repurpose it into some kind of frankenwatch to behave as a diving watch, is counter-intuitive to the fact that, it will lose most it's useful features, freely admitted to by the author in the article.