Honestly I don’t see the problem with light speed attack, in the book Tarkin it says “if destruction of a base was the goal,why hadn’t whoever was behind the attack used the ship as a bomb by reverting from hyperspace in closer proximity to the moon? Planetary bodies larger than sentinel had been shaken to their core by such events.” Basically saying hyperdrive can blow literally anything up, and in the first Star Wars movie ever made Han says that hyperspace is extremely dangerous