I am very sad that 3rd Rate Ship of the Line will now be obsolete in the game as they have no place to fit in, too big for hunting in open world and not allowed in most Port Battle, and not big enough to go in Regional Capital Port Battle.
3rd rate were the most common ship of the line historically speaking, so they should be the more common in game.
And for that to happen i think a good start is to allow them to be the more powerfull ship in the most common category of PB, the new "medium" PB category.