Squad movement is one of the most important things in paintball, the ability to move your squad from area to area in the most effective manner possible. Without Squad Movement you'd be playing a defensive war the whole game and Defense does NOT win games.
Heavy weapons on the paintball field are actually a very important and rather fun factor to the overall outcome of any battle that you'll ever enter. Although some battles have different needs and therefore will Require varying types of heavy weaponry, for example; a mine is almost useless if you're not playing outlaw or Scenario games. But even on small fields grenades and fully automatic or fast shooting weapons can be a definite moderating influence.
The Intelligence factor plays a huge role in paintball and it keeps on cycling. Without the Intelligence Factor (IF) many teams will end up losing instead of winning due to a large troop movement or ambush that a Sniper or Observer failed to notice/tell the Commander. It is important; just get that in your head right now.