WvW as it is now (no event), is balanced. Most of the siege weapons are actually useful. If you boost one, for example the golem, the golem becomes overpowered, and WvW unbalanced. Unless the golem also receives a handicap. I would have loved to see an event with fast golems that cost no supply, but do half of their original damage, as that balances it out (at least a bit). But like this you just spoil WvW for everyone who loves it, because there is a damage boost instead, so golems are completely overpowered.