Frostbite is used exclusively by EA, it's not really worth comparing to something like Unity. Any engine changes would be prohibitively expensive, as they'll need to buy the license and spend the time to learn to effectively use it and then port the game over. I believe most of the lag problems are on Muse's end and can be fixed given enough time and resources. They probably will if they eventually meet their stretch goals in subsequent kickstarters. I don't think larger scale battles are entirely out of the question from a tech standpoint, I think the bigger problem would be managing communications. Have three fleet commanders on each team to function like metacaptains?