I dont know Elite lore, or design reason why implemented this way - but i can give you the logic of 16th-21st century history and precedent.
ever since humans have made things that go boom / launch / fire things, our ability to propel that ball / bullet / missile / thing has been more powerful than our ability to accurately target that thing to go / land where we want.
in mil-speak, every piece of military hardware or weapons systems has a max range and effective range. Maybe the Elite universe tech progression has been no different than our real one - jump drives may be able to slingshot you by power whatever range your tank full of juice would allow - lets say 180 LY.
but the targeting scanners and systems may only be accurate enough to plot and jump you a fraction of that distance.
not saying i wouldnt like increased jump ranges myself, but you asked for a logical reason and there you go.
maybe a new system where you had a max and effective jump range, and the more you pushed outside your effective jump range, the increased odds you'd land a few systems over, many-many light years over, or materialize inside a dwarf star
that kind of increased risk / reward tradeoff would seem like a cool new feature.