The ability to siege into the enemy's base is difficult particularly in AoS because of two reasons:
- The small choke point in the entrances
- The area within the base is very small and does not favor teamfights for the opposing team.
These two factors make it very difficult for equal footed teams to fight in one's base. Usually one team has snowballed to reach this point and so this doesn't mean too much but sometimes sieging the base can be frustrating.