> you need them to agree

The app would say - meet here.

> One might call such a meeting point a “bus stop” :)

Call it what you want, it could be in a strip mall parking lot, a convenient corner or just in front of the apartment building. Optimized for traveling distance between the passengers.

What’s the point of making this dynamic? Go find a city where people are out, having fun, and not buried in their phones, and where the city isn’t full of strip malls and parking lots. There will be people who want to be picked up during busy hours, and having a shelter from the sun or rain is nice, and having a place where there isn’t a parked car or an uber in the way is nice. Lots of Asian capitals are like this.