I think if the game is having so many trouble with the land combat mechanics, it should focus on diplomacy and maritime combat mechanics. The timeline of the game is one that we saw empires based on land power descending in importance and empires based on maritime power and commerce gaining the upper hand. Greater empires like Russia, Ottomans, China and Mughals, after its expansion phases, have limited power in interfering on nations that hadnt a border with it. On the other hand, Portugal, France, UK, Spain and Netherlands, all, in one time or another, could interfere in lands far far away from home. And they could estabilsh monopolies in trade routes that were never so great, by that time, as it were in the game timeline.
I means if you are only focusing on the trail end of game and only on Europe then sure you could do that.
But I heavily disagree with this approach, EU4 already has tons of this (institution as a mechanic, some trade node disparity value only make sense if you think of them in 17-18th century, etc), the new game need not repeat the same fatal mistake of their predecessor.
If you broadening your horizons a bit, you will find some counter example to the idea that land based empire bad and maritime based empire good.
Like Ayutthaya starting as maritime city-state that focus heavily on trade and raiding all their rival port city (Malacca got raided by Ayutthaya so many time that they had to called China for help for example) that increasing transform into land based empire from interaction and cultural exchange with northern cities and I would say their later iteration aka the one the became land based empire is more powerful.
They became one of the greatest SEA polities, controling more lands, people, becoming richer and overlord of various maritime polities in the south compare to from when they were maritime polity.
Ayutthaya also only got threatened by peer power land based empire such as Burma, no maritime polity ever threatened them (well unless you counted 300 Malacca soldier attempted coup when Ayutthaya was besieged by Burma, but they all got slaughter for their troubles lol)
The first time Ayutthaya fall was from intrigue and power struggle between the northern cities and the southern cities, the second was because hundred years of peace making them neglect military, focusing exclusively on trade and weakening from factionalism (almost every successions were a coup, this the downside of absolutism or at least power concentrate heavily into monarch), well also cuz Burma is plain better at war, see China trying to conquer them and failed.
So at least in SEA, the opposite happened, the land based empire prosper and subjugate the maritime one.