> Sea-ready boats were always scarcer and more expensive than weapons in the first place
Coast-hugging boats can be made from wood with some skill. Weapons in that era requires metal in some part. That required a lot of skill.
I think you slightly underestimate how much work and expertise it is to build ships that can transport an army over a long distance on sea.
I think you slightly underestimate how much work and expertise it is to build ships that can transport an army over a long distance on sea.