We are your cheerleaders! We are here for you. Your questions are helping 100's of people learn. They are reading the posts thinking "I wondered about that!".
Just like your question of why to sew 1 to 2, 3 to 4, and then have to come back and sew 2 to 3 and 4 to 5. I thought the same thing you did. I sewed mine 1,2,3,4,5,6, etc. I had read that I needed to start seaming at opposite ends as I finished seaming each row together. So I did do that and everything worked out fine.