Exactly. And you can get to the objective first with better dice, but all your opponent has to do is bomb you off the bridge.
So it's extremely unlikely that one player will get far enough ahead to hold the bridge AND the spikes... therefore it goes to round limit.
And if you get behind in the dice fight against neutrals you can only hope your opponent takes the extra spike neutrals and gives you an opportunity to use attacker advantage to even things up attacking him...
If you desperately try to sieze the objectives before the round limit since you're behind in troops, he will just bomb/attack you and unless he gets really bad dice, attacker advantage + troop advantage hands him the win.