Personally I use the F10 map for an initial heading for the FC3 aircraft and use it as a flight planning tool for the Viggen. Being able to visually pick nav points and then also being able to get the target Elevation while in game makes flight planning with it so much easier.
I can see both sides of the argument for losing it. However, due to the tech available in today's world (and since the 90's for the most part) and for the ease of my Viggen sanity, I cant support getting rid of it until a better alternative is presented.