I was thinking and forgive for it may not be an original thought... however

The sea surrounding our Islands is a great mass for more enemies to gather and be knocked off, if we were to grow bigger sea ports, and build majestic boats, which are powerful and fast.

It could also be a means of PVP later on if it was to be introduced (not wanting to be presumptuous oh creator beings), whereby if a person was willing to engage in battles could use the sea... (If it pleases the creator beings, if PVP were to be introduced that it was voluntary considering all the love, care and devotion we put in to our humble settlements)

Not sure what the masses think but here is my thoughts.. and I humbly apologize if it is not original