As you know small Space Marines count makes them "swarmed" by xenos in close combat battles. That's the problem - for example when you have assault marines and they get swarmed by numerous banshees squads they are "pushed" all the time and instead of fighting they are walking around, getting hit all the time and just sometimes make one attack and starts walking around again. It was making fight harder. That is very bad glitch from DoW2. In DoW3 the Space Marines should be "unpushable" for small xenos.