Hello Boloburn,

I think the tutorial is not too good and the resulting coastlines doesn´t look good quite good, so far you are right.

I alwasy draw the coastlines by hand so I can manage my countries as I want them to be. One first step might be to decide the scale of the map, whether it showa a region, a country, a continent or a whole world. It could help to decide, if you want to have a clear and smooth coastline like in Pommerania/Poland or a more diversified coast like the Fjord Coast in Norway. try to copy and modifie existing coasts of regions in a similar scale, maybe by underlaying a photo af a certain region...