Possession is great, but there needs to be possession with a purpose. Choosing the right opportunity to attack is what makes the game that much more important, how you get there is what is trained through coaches, and watching the game. Kicking with no purpose other than the hope someone can do something or it takes a lucky bounce is what good coaches want to get away from. Long balls, with the right weight and direction, are not bad parts of the game as long as they have that purpose of finding a teammate or putting it into the space for their teammate to get onto it.
Decision making is what separates the top players from the next level, however still at this very early age kids should be fully focused on the simple technical development of receiving the ball so they have a chance to implement the decisions they are making. One without the other just does not work. Learn all techniques. All different types of passes, not just short. All types of control, front foot, back foot, aerial, all finishes, individual dribbling skills etc.
You play possession to move the opposition to create a chance to go forward and score a goal. If you can drag the defending team away from the goal they are defending there is more space to play in behind towards the goal.
Anyway got off topic... It is a lot better to watch the young kids try to play now a lot more than even 6/7 years ago. Not saying it is always perfect and always possession but it is at times and more enjoyable.