The best it can do (even ignoring mining to refuel) is 500ly per 2 hours... An Anaconda can do that in a dozen mins... That's ten times worse, and it will most likely be more than that!
While the FC's travel speeds are fine for the bubble (maybe), an exploration FC will make little sense for any exploration of regions a reasonable distance from the bubble. ie: Why take a month to get to a region to explore it with a Exploration FC, when you can get there on a couple of days in an Anaconda? Especially when you'll have to mine over, and over, and over, and over... and have the same issue returning?
What would be the problem with being able to upgrade your Exploration FC, at huge expense to your 25000 units (eg: meaning no, or limited shipyard etc), to allow it in effect to travel at say 50% of the speed of an Anaconda? What harm is being done making an Exploration FC, more appealing to use for exploration?
Do you even explore? Where have you explored?