Yep, I can see what you mean.
I'm always uneasy with gameplay limitations.
I tend to agree with your suggestion. For example, making the invasion/re-embarkment process slow and uneasy, letting your landing force exposed to a deadly counter-attack would have been more elegant and realistic.
With the chosen solution, the player is left with the supposition that the troops burn down their boats after they've landed on the ennemy coast.
Wow, very "persian"
McClellan asked, "What troops are those fighting in the Pike?"
Hooker replied, "[Brigadier] General Gibbon's brigade of Western men."
McClellan stated, "They must be made of iron."