Not looking to be mean but due to the point system as it is there's a disting feeling of lack of progress in the campaign. After a hundred turns and building the mightiest fleet you can you face Abaddon the despoiler with 2 battleships and 2 cruisers. It just feels underwhelming. I also miss the previous game's system of escorts that would be replaced automatically. As it is escorts are more or less useless unless you're roleplaying.
And I know the game can handle more, there are campaign missions with dozens of ships arrayed against the player, like in the Tyranid campaign during the craftworld assault or like in the imperial campaign where you fight the planet killer.