I have the Tiger 900 Rally Pro and I love it to bits.
If I had known how s*** the Triumph app was I wouldn’t have paid for the Bluetooth Module.
You can do A to B Routes and you can plot Routes (iOS is limited to 20 waypoints I think)
But the User Interface for adding those waypoint is horrendous.
As @PAD-0 said the Triumph Connectivity App is indeed a closed system and the only thing that will resolve it is to give it the ability to import GPX Files which it currently can’t.