The content explorer could show all routes but the drive menu could only show routes that contains some scenarios for example
I agree that that is an option. But the route interface in the content explorer, whilst being completely adequate for its purposes, is not as nice as the - simply outstanding - interface in the drive section.
For me the route interface in the drive section serves a broader purpose than simply selecting a route or scenario to drive. It also shows off my collection. And it does so in a way that has never been done before - with large pictures that. in many cases, have appropriately been chosen (although there is room for improvement here in some cases).
That "collection overview" feeling is bound to apply to other users too. And it would be lost if routes without scenarios are no longer shown.