I want to add a few key points from the video.
1) The main strength of the army is the opportunity to hit from the reserve.
As rule, the alpha strike of the enemy is wasted. Our troops on the table stay in cover and play the role of anvil.
We inflict the first serious blow in direction unexpected by enemy. Our deep striking units shoot, then charge in melee.
2) Heroes have important strike potential. They allow us to relive the deaths of many troops and win.
3) BA have powerful magic. All powers are very useful. Mephiston is excellent. Inquisitor's psychic power help us to deny enemies overwatch.
4) Opponents are not waiting for close combat. This, together with shooting allows us to cause great damage to the enemy.
5) The Army is very mobile.
Sorry for my terrible English