Jemini

The honest answer is: it depends on where you look. On simple changes, FST adds a small amount of upfront structure. On complex changes, it saves you more time than it costs — because it moves the expensive parts of the process to where they can be resolved cheaply.

You know the feature you want, but not yet which direction should become the product.

That is the moment where AI is most tempting and most dangerous: it can build a plausible version fast, but a plausible version can quietly become the direction before you have compared the alternatives.