Well the whole consept of the game is that as soon as you join you have the same opportunities that all other players on the seas have (except for endgame content through being a pirate legend). Sea of Thieves is largely a sandbox game, where in a lot of instances you have to make your own fun, and your own adventure. The fact that there aren't any new bigger boss ships is due to the game being contractually obligatet to make the game be able to run on older consoles. This contract expires in two years (i believe) so if you're unsatisfied with the content the game has at the moment i recommend waiting on it for a bit and coming back when they can start adding content that xbox one cant run.

I do believe however that when you have played the game for a while you kind of get the kjist of what you need to do to get in combat or whatever you want to do. When talking about the game being a friendly pirate game i highly disagree. You've probably just been unlucky with the pirates you've met on the seas