The "follow roads" feature in the route creation section on the Garmin Connect website has been removed. This is a huge mistake, and the once excellent "route plotting" feature has become terrible.
To me it sounds like they've just renamed "follow roads" to "most direct / minimise distance" to emphasize the fact that it chooses the shortest route using roads (unlike most popular, which favours popular…
It will always follow roads unless you select "Freehand".
The dirt roads are probably not that popular for road cycling. You can try making it use those roads by putting the points closer or right on the road.
There are three options;
"Most Popular
Routes others use most",
"Most Direct
"Minimise distance"
"Freehand
"Draw your own route".
Previously, there were the following options:
"Most Popular"
Routes most used by others,
"Follow the roads"
"Freehand drawing"
"Draw your own route".
With the "Most Popular" option, there is no problem if "follow roads" works, even if they haven't been used before.
Nahh, lots of dirt roads works great with a road bike. As long as they are hard enough and without gravel. I'm stuck on 25 mm tires since my fork can't take any wider. Otherwise I would go to 28 or 30 mm. Where I ride there are lots of hard dirt roads between nice paved roads so I use them to find the best course for the day.
Here is where Strava routing is a lot better. You can see what type of road it is routing you on so you can make it chose a different road if you just want fast paved roads or if you can accept some unknown roads or shorter dirt roads.
The popularity of each road is also displayed in a great way so you can find roads that will work for a road bike but the routing isn't using it. Garmin's heatmap is not good and easy to see and if you zoom in it disappears.