The land generation- would not be so thrilled about. I like to explore.
Seas are always a nice idea.
The world needs to have proper biome assortment...hot, cold. mountains, jungle, deserts, snow.
J&L have seasons planned.
So the World will likely change to that kind of degree. and Q of crops and speed will drop in colder areas, where mining would be rich.
Likely a lot of other small little things...
Sorvereignty
I see this works similar to Ladygoo and my own relic ideas. but more of a king of the hill winner take all.
The problem with this is the same as Ladygoo and myown relic idea.
People will just end up joining the greater power cuz of bonuses and their will never really be any real war.
In this, any time a faction on a main island or any island that does not comply to the rules of current faction in power. that faction will be destroyed.
See world 6 as example.
Trade
the idea charter stones not being able to teleport over sea, brilliant (i hate charter stones)
and again seas + dmg also good idea.