I’m assuming because certain OS’ don’t natively come with apps to locate wifi nodes, and you need a bit of help locating them.
Plus, it can help you locate some of the weaker-signaled ones that you can then target with a directional antenna.
Yeah, I did think of that. Cat, wearing an omni in the back yard, finds a weak access point for which you can then aim a directional. Still seems like a lot of effort sunk for not much “gain”. (Antenna joke, LOL)