It's quite annoying that the Garmin support site still refers to this as though all Edge devices can do it. The Garmin Connect tip is quite useful - never thought of that so thanks. I tend to use routes that are on ridewithgps so I just get them to configure the connection between the two services then Pin & Sync if they need the route and it will obviously make their life easier from now on as well.
I used this feature to share routes between 1030 Plus's multiple times without issue, and I LOVED it; it seriously saved several 200+km ride experiences because once you're on the road, your options are limited when you find out someone has an old version of the route or something.
I'm crestfallen that they've removed this feature from the 1040. I discovered this last weekend as my 200km route was broken, and I couldn't get a refreshed copy of it from someone else's Edge. It would have been the end of my ride, but I ended up having to use hundreds of hand-written cues instead. In the cold dark rain.
I wish I'd known this feature was removed. I would not have bought the 1040.