It opens a pandora's box though. Because it WAY more evenly matches the FO and the Resistance, and Empire and Rebellion.
It's like saying that a small terrorist group is somehow able to turn regular gunpowder into a nuclear material. It turns the "brave band" assymetric warfare (small group with little gear versus gigantic monolith with planet-sized spaceships) that is the staple of SW on its head.
What you (and others) don't seem to understand is that weaponized hyperspace is a TOTAL game-changer for the SW universe: making a small band of rebels with hyperspace-capable ships able to take out massive dreadnaughts, Star Destroyers and even possibly a Death-Star-type station (though I know people are already retconning "shields" to plug that gushing hole.)
It also DESTROYS the aspect of valour or bravery seen in OT battle - it makes a mockery of those idiots who attacked the first Death Star, and all the other bravery seen in battles seen in the OT. Because it was all a waste because a simple, super-easy, low-cost option that ANYONE COULD OR SHOULD HAVE THOUGHT OF was available.
And so say "no one thought of it" is willful evasion/blindness - we see vast scientific research centers in RO, the intensive technology that built star destroyers and death stars, and you have a rebellion on its desperate last legs, massively outmatched and outgunned, looking for anything to help in their fight...
And people are seriously going with "no one thought of it before"? .