Height was both an aesthetic & a practical consideration.
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Section of 1841 Model 6 pounders. Stones River Living History Demo.
In the artillery the tallest person on the crew is #1. Handling the sponge rammer & firmly seating the round is greatly facilitated with some height & bulk.
It also means that more often than not, as in this section firing from the left, my 6'4" self is only seen from the back.
By the same token, on right gun the least of us is #2. My wife Anne loved being at arms length of the muzzle blast.
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Having the line arranged by height is a practical as well as visual matter. A line or column looks tidier with the soldiers in order of height.
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In a double line of battle formation, having me in the front line & in file behind me my wife would have been akward. On one notable occasion she was third from the right end of the line & on the left flank a 6'7" corporal. She could have used his cartridge box for a rest.
There is nothing quite like the laying on of hands in living history & experimental archeology to give you, "Oh…that's why they did that!" moments.
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Note: in the age of smoothbore muskets, they did not have the order "Aim" in the drill. Instead the muskets were leveled. A sergeant carried a spontoon / half pike that he could use to reach out & tap an errant musket barrel to level. Obviously, having the ordered height facilitated that.
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The spontoon was held up where the shiny tip was a flank marker. Behind the line, as in the illustration, the sponson was used to straighten the line .
Link
ageofrevolution.waterlooassociation.org.uk