I think the biggest "problem"
we, some, others? have is to not get exactly what the whole Design is about.
1st of all i dont know if there are open sandbox PvP with full loot games on xbox.
PC players, but for sure not all and also just a fraction may know UO, Darkfall, LoA or played on Conan Exile PvP servers, Ark or whatever.
Rare did all right and - depending on personal taste - even better like these games, because of having no vertical progression and therefore a guaranteed gamemechanically even playing field.
Sandbox PvP is and need not be perfectly balanced. Like zergs doing PvP or having the imbalanced of Galleon versus Sloop etc.
It's all about the players to organize themself etc...
And sandbox PvP is an open to everyone party.
If you login to Adventure mode you agree to be exposed to PvP and to be able to attack others.
No guarantee PvP will happen or PvP wont happen.
Players can do a lot to avoid PvP if they dont want to.
Needs some knowledge about the Map and all plus beeing cautios as hell and better be not alone.
It's a Multiplayer game and a sandbox more or less, so this is all up to the player.
I'd say you cannot 100% avoid PvP if you dont want, but if you organize yourself you can avoid PvP nearly up to 90%.
Scuttle would be 100%, but i'm talking about a way without giving up your ship and loot.
It highly depends on the players and their chosen ship, their knowledge about the Map and the gsme in general and for sure what they want to do etc...
People who want to PvP in the Adventure mode have a much harder time and zero guarantee they will find other players to attack.
That's also a significant fact about every other open sandbox PvP game.
I was out to pk in other games for hours to find someone, searching the generous farm spots, for SoT this is Forts i'd say, and anyway didn't find someone to kill and rob or they were just too many to attack.
You also need to think about this.
In SoT a "Pirate" who set sail to plunder others only has absolutely no downsides other than that it's not guaranteed you find someone who has booty.
Therefore we got the Arena.
That's for sure not what sandbox pvpers want.
Bit sandbox pvpers should know what it is about their playstyle.
And it is not guaranteed PvP or loot.
If Rare would incentivice it or change something about it, the whole thing about players would run out of balance imho.
What you want more as a sandbox pvper who want to get loot from other players is PvE Spots like Forts that these players do and you then can compete over.
Sandbox PvP is also to roam around, prepare ambushes, lay traps etc... and a good amount of time is lurking and no instant action.