That's really the point here. Time sinks are in Turbines favor and leaving the game due to burn out from time sinks are their danger. Finding that happy medium between burning out in the preparation phase and burning out in the end-game phase is the trick. For me, leaving in traversing the map is borderline here. While it wont be to onerous to do it some, the game will have fewer options as I'm not willing to do it to the extent needed to maximize my options. In other words, I wouldn't take a fighter through 4 levels of SD and 3 of FS just to be able to twist in Energy Sheath situationally. But I might endure 3 levels of SC to get to FotW and Cocoon.
This is likely about what Turbine is looking for as they sell an item that would ease those concerns (I just refuse to buy an item whose only purpose is to get around a complication created by the seller).