If things get a bit much for you on the battlefield and you see no other option than to flee, you can quickly retreat to your Shelter Plane and catch your breath. After all, there's no shame in surviving, and when you feel ready to head out again, you can simply pick your waypoint of choice.Of course, you'll need a bit of space to make the transition, so make sure your enemies are not too close when seeking shelter...
What the point of flee then? There is no reason to use it if you can just warp into your secret home anytime you want. Technically, it is a huge exploit and you won't lose any battle with it.
It's not an exploit because your enemies are still there when you come back. In a real time RPG you mostly have the chance to run away as well and come back later when you have a better strategy, equipment or experience.
But I think - and that's what also is written in the text - that you shouldn't be able to flee easily if you are in close combat. Then there should be at least the chance that the enemy could hit you before your attempt to flee succeds (an additional initiative throw for the enemy).
