If extremely long range weapons are implemented perhaps a different option to making them incredibly week is to make them extremely inaccurate. If you're firing a weapon at a planet from such great planetary distances accuracy will probably suffer do to planetary rotation and system rotation so ti would make sense that bombarding a planet from beyond the range the planetary defense guns would make hitting targets hard.
Perhaps a combination of weaker weapons and inaccuracy?
Also if you're going to implement extremely long range weapons then it would have to be possible to also build them on planet. Which would also just negate the whole 'firing from outside the range of the planet's guns' thing anyway.
Perhaps a combination of weaker weapons and inaccuracy?
Also if you're going to implement extremely long range weapons then it would have to be possible to also build them on planet. Which would also just negate the whole 'firing from outside the range of the planet's guns' thing anyway.