The only part of my post in large font is my singular point of emphasis, for everything else I have either used BOLD or Italics still that is beyond the point.

Now I shall say this for the last time, the emphasis of my post is not on a more Agressive AI, what I am reffering to is the inability of the AI to transport units/stacks from one theatre of war or from the mainland to the islands or vice versa using naval transports.

And if Transporting armies by sea is risky! where do you think the British Armies during the American War of Independence came from, did Dr.Who transport them over one by one in his Tardis??

The fact is in this age more so than others previous to it sea trade including bulk goods was more important than ever. And the first global war the seven-years war (1754 to 1763) was fought simultaneously in multiple theatres during this very period-
North America
Caribbean
Indian Sub-continent
Europe

All of which would have been impossible if sea trade/transport had not improved and become reliable to the point that the the british would deploy several thousand german mercenaries during the american war of indepence.

Your point about naval invasions is true to a certain degree but my post is not only about naval invasions but is a more holistic query combining elements of the Lack of Naval Invasions and the above highlighted point with the emphasis going to the latter.