First of all, I really like the clean presentation of data in explore, and the ability to manage routes and waypoints on my watch (Enduro). That being said, it would really be helpful to be able to get TBT course instructions. Currently only .gpx can be sent to the watch from explore. It would be great if there was a switch to enable TBT for a particular course, and have Explore generate that on the phone and send it to the watch (or other device). In theory, it has the maps so should be able to generate them. The server side solution implemented by Connect is not that good, IMO. i suspect it is only looking at the track and not any map information at all (for intersections and the like).
I think that I'm not the only that prefers a very minimal presentation of data when bouncing down the trail - I find looking at a route only, with some landmarks or other waypoints on the map to be an ideal solution - a topo map or street map can get way too busy and complicate the display of data.
My work around is to use gimporter and a third party site to generate the fit files. It is somewhat of a kludge.