Comment by LorenPechtel

Google's mapper has an option for whether to minimize walking. Turned on, it will do things like this, prioritizing the route with the least walking. it would be quite willing to do this sort of thing. Turned off, it will prioritize based on arrival time.

There is a maximum walking distance, I don't know the limit but it's certainly more than 10 minutes. I have never managed to trigger it other than by asking for a route to a location miles beyond any transit options. And it did provide me a route across the Grand Canyon. (Most people are not doing a rim-to-rim in a single day.) (But then it was totally bonkers--offered me a bike route with a time that was preposterous. Looking at it--tiny portion by bike, then walk your bike--the standard rim-to-rim route. But it assumed bicycle speed. No--try that, you're going over.)