Their perception of adulthood is definitely different from ours, that’s true. I like to think, also, that part of the reason for Mikoto’s favoritism toward Sasuke has to do with the fact that she had him during a peaceful era instead of wartime when she had Itachi. So like Itachi, she may see Sasuke as a source of hope for the future. (basically Itachi is a victim of circumstance even when it comes to his own mother yikes)
[[ Consider, Itachi being able to be close to both his parents
Also yeah, Fugaku basically “took” Itachi and Sasuke was her chance to actually baby her child. Sasuke doesn’t actually have the kind of pressure on him that Itachi does. Besides his insecurity regarding Itachi and trying to get Fugaku’s attention amidst the clan/village crisis, he’s pretty free. ]]