Ah, I’m slowly getting there - your suggestion for the need to select Survey is not entirely correct. Certainly it does enable the waypoint button, but its use is to configure the mission specifically as a Survey mission, I found that if you just want a basic mission, starting with the ‘Clear’ option on the File menu will allow insertion of waypoints (un-greying the waypoint button) after you have first clicked the takeoff button - which creates the first takeoff waypoint on the map then allows subsequent waypoints to be added to the mission. I reiterate my earlier point - not entirely intuitive, but very powerful and clear to visualise the mission. I especially like the terrain chart at the bottom. Very nice feature - way ahead of Mission planner in this respect.
But what about a mission which you want to simply start during an existing flight? What does it do with the takeoff point you have in the plan if you are already airborne?
Edit: I now realise that you can delete the takeoff point from the mission. So if this is allowed then when we are creating a new mission, why make us first select a takeoff point before we can place waypoints?