Defenders are already playing from the theoretical high ground in any case when some considerate tactics involved that isn't sitting idly by the base hoping for a miracle. While it is easier for attackers to achieve their goal, sieges are forcibly stretched over a few days by the damage cap attackers can cause to the besieged base, so defenders are guaranteed to have a few attempts at defense.
Not to mention the fact of PoB months long immunity to declarations after two weeks long siege period.
Not a problem and does not need fixing, especially with /conn disabled from pobs, thus preventing deployment of disposable staging points nearby the besieged base.
Peace, being the distant dream it is, comes inevitably, and goes hand in hand with justice.
Cursed be the war. Heroes never die! @Vitoniz30 @Connor