Sometimes a hosts' directions are much better than Google maps or anything like that, it's not always a matter of the guest not bothering to do their own research. The host knows if what appears to be the shortest route may not be due to traffic, poor road conditions, etc.
I once caravanned with another gal from the US/Mexican border down into Mexico. We were both coming from the same general area, but we each had different things we wanted to do along the way, so we were meeting at a motel at the border. I told her what route to take, as I'd made the drive many times. Instead she followed Google maps recommendation, which took her hours longer, through mountainous terrain, her cat projectile vomiting the whole way, and leaving me waiting for an extra half a day.