I've done trips with and without top boxes... doesn't really affect the trip much as you will adapt your packing to whatever is available.
But, having a top box is nice for a quick/easy access to misc items you always want on hand like cap/flashlights/cell phone/diff gloves, etc.. and if you add power you have a lockable charging station.
But, having a top box is nice for a quick/easy access to misc items you always want on hand like cap/flashlights/cell phone/diff gloves, etc.. and if you add power you have a lockable charging station.