"Hindered countrywide" ?? What does that even mean ?
What nonsense. It's a technology like any other and researched like any other.
Why does it matter so much to you to make ships in your capital ?
Wait, "seafaring" ? That's a cultural characteristic, not a tech.
Are you talking about CK 2 or 3 ?
Shipbuilding rather, I am playing 2. As I wanted to try out 2 while I wait for 3 to go on sale again.
The post had cited that, since tech spreads out from the capital hold's advancement and since the capital has no sea access, it wouldn't advance much in that tech, so it advised to move capital to a duchy with sea access. Though it could have been an answer to a question for 3 rather than 2. I had been looking up strategic capital placement when I found said thread.
Assuming that, ships do not really do anything for Catholics other than cross troops to islands, it would not really make a difference.
It seems like securing a larger Duchy to have comparable levys to your total vassals is more a priority than being able to make ships; I just was not sure if being inland hinders my ship technology for my vassals that can make them in later game.
I had typed the previous message before I had seen your edit, sorry.