As for why it was not focused on more for I:R 1.0, the answer is simple: they chose to focus on something else. If better Naval System got it, something else would have to be removed to compensate.
Then maybe dev teams need to be bigger.
Frankly, it doesn't seem that difficult to me to have a fleshed out naval system. I'm just rapid fire spitballing here at 5 am because insomnia:
- Military vessels should be divided into two classes: Heavy Warships and Light Warships.
- Heavy Warships would not all be equal. The player should be able to mix and match the heaviest warships, like the deceres, with lighter heavy ships, like the quadrireme. While the heaviest warship may boost a large contingent of marines, it would be expensive to have a fleet of all deceres, for example.
- Light Warships, on the other hand, would be best served as anti-piracy vessels (or for state funded commerce raiding), scouts, and troop transportation. Lembus would be fantastic for both raiding and troop transport, both on the sea or against unprotected settlements, as would the trihemiolia which could even stand it for poorer nations as a front line warship.
- 1