Is it just me or do you think that krs having his memories of his past life isn’t needed all he really needed was memories of the book everything else about his past was useless it’s not like he used it to improve the world or start a business to make money or anything all he really needed was memories of the book to survive and know of the dangers ahead
Him having his memories helps the readers understand his actions. Unlike other mc who travel to another world KRS's experience in 'Korea' makes him a good leader able to command battles. Other mcs just magically have the ability to fight and live in the harsh other world, theres no logic to their ability just that they're op. KRS's experience makes his abilities more reasonable.