A tactic of quite a few players in my area have been dumping a lot of their army in reserves at the start of the game and roll them out over time. In fact, I've seen players only deploy a heavy choice or two and leave everything else off the table.
Of course, this give your opponent less time to shoot up your army and the added bonus of being able to swoop in late in the game and claim objectives and it seems like the late deploying armies are winning more games than players who start off with units on the table.
Is this tactic very effective elsewhere?
I know one player conveniently forgets to roll for his BAs until turn 4 (which seems to be a huge advantage with all of his movement and hes able to claim/contest or make a late game assault with a full strength unit).