The ones that you marked are what initially pulled me into the game as well, as there's really not a lot of mmos that offer an open world sea with ships and naval warfare and whatnot. But yeah a lot of open world PvP has to do with how many numbers you have - for example you're going to have troubles capturing a merchant ship with 10 people on it as a 3 man pirate group. Much more so on the north continent with castles and sieges. Expect enemy raids of 100-300 people there
Most fun I had was on the sea with a lot of battleships blasting eachother out, or just big group fights on Freedich island.
As for my Yata farm, none of my females got pregnant. So this means back to waiting several days, if not weeks for one of my males to become stud again... this game manages to pull my nerves quite often. Fuck this RNG and these horrible mechanics because devs were too lazy or too greedy to think of something better.
I'll be playing it until I manage to sell my account. If anyone is interested, PM me.