After reading your post, I understand that the changes will in fact be going through, but now that I've had a chance to read what some of the ideas the team has discussed, I can better share what I feel and how I personally think this should be worked moving forward. I'll start with quest items.
Quest Items should be tradable because the system will have too hard of a time differentiating what would be a quest item and what wouldn't be, making it difficult for players to trade with each other something that could be used for just every day use just because it has ties to a quest. However, a way around this is to mark items that are traded so that they will not count towards a quest and people can be able to use the items that they receive normally besides the questing aspect.
Disabling Trading on your own pirate is good for those who would rather not receive any trade requests because honestly, no one likes being spammed with those kinds of requests, you could receive a hundred a day if that weren't the case. But I've noticed that quite a few people have come up with the statement of trading items (even Legendaries) to your own account's pirates wouldn't be an issue because "(Player) specifically put the hours in to receive Legendaries and other good items". Personally, I like the thought of this but it could use some tweaking, like (Pirate must make it to * [Skill] Level before receiving items from any class {Sword, Gun, Voodoo Doll, etc.}) And that just brings me to my next point.
(Raven's Cove Quest) To trade for a cursed item. I do like this idea, as this quest only becomes available at Level 30, which most pirates at that point have nearly maxed or maxed a certain skill. When I think about this idea, my opinion is that lower level players should only be able to trade lower level items, and that higher level players should be able to trade whatever they want, similar to an unlock system (with the exception of Cursed Famed and Legendaries). Famed and Legendaries should only be tradable between other Famed or other Legendaries of EQUAL value, so that no one is losing out, possibly creating a new class system for legendaries that only certain legendaries can be traded for certain legendaries (similar to a bronze, silver, gold) system based on power, rarity, and usability of the item.
Anyone can feel free to comment and tweak upon what I stated, as this is an open discussion and I'd love to read more about what other Pirates believe should be changed or tested upon, as even though many of us have argued on this post, we're all still working to keep this game alive whether as creators, testers, or players. Don't hesitate to put up new suggestions for the system, that's what the forum is about!