Being able to select the start position is a very important feature in the team rank

Age of Empires IV IV - Discussion
1

Especially in Maps like Gorge， every time after you select the civil， you can not know you will start on the front or on the behind。 For example England are best on the front

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2

Its totally diffierent between France at flank and France at middle in any map like dry arabia. We can play many specific civ combination for make some powerful strategy, if can select start position. Just like AoE2:DE.