The November 2018 Xbox update brings with it keyboard and mouse support for the Xbox One. I assume it won't be long before Sea of Thieves offers this, especially since PC players are already using them.
I found it interesting that Major Nelson stated that Fortnite will be "matchmaking players using the same input together with one another to ensure a fair and fun experience for everyone."
I wonder what implications, if any, this will have for Sea of Thieves.