A valid analogy can be made for duals to unsung heroes. Many of them give so much to an account but do not get any prestige or achievement in return. This is an ongoing request from the community so this topic might not be about if we need to implement this, it could rather be about if it should be implemented as top priority or if it can wait .
There are players here who are much more experienced than me and could have better ideas on how to implement this so I'd urge them to please present their opinions. The only downside I see is that duals do not have anywhere to showcase their medals and prestige, but I do believe that this is something which can be solved in game design by incorporating dual's avatar (even if smaller in size) on the main account, with their name, and the main account can be allowed to showcase any of medals from duals and the overall account can show the highest prestige from either account owner / dual.
It'll also be need to addressed how account owner can remove duals at any time, which should not be the case and it could be something more on the lines of kingdom union, i.e. once you dual an account for 1 server you cannot remove duals or delete account without mutual agreement.
There are many other factors which are hard to cover in one post by one person so please feel free to enlighten us all in the chat below on what you all thing.
Sheila Could we please have some thoughts on this from the perspective of game designing. I reckon you're the best person to bring this issue to.