I thought your points were great thanks for sharing.
Picture this situation:
You have an expansion on the 6 o clock position your opponent is orc at the 12 o clock position. He is tier 2 with a decent sixed army or grunts,headunters and wyverns and a BM that never ****ing dies.
You are Undead with a Dk,LK 4 Fiends,3 Gargoyles, 2 Necros and 1 wagon with the ability to turn tier 3 quickly on the 9 o clock position on a medium sized map. Your expo is defeneded by 3 spirit towers and you are being attacked heftily.