Exactly. Here in Tokyo, there is a local app that's tied into public transit just like GMaps, but all it does is tell you how to get from Station X to Station Y. If that's all you want to know, it works quite well. But most people want to know more than that: where is Business A, and what's the fastest/cheapest way to get there from my current location? Which station exit should I use? And oh yeah, how are the reviews on it? And can I see the menu, and place a reservation too?

Apple Maps does this

Transit is generally pretty awesome.

https://transitapp.com/