I only think you should go deep after you learned concepts shallow and wide. It is important that students, very early on, be able to build interesting and meaningful things with their CS skills and experience the associated gratification.

For many people this is essential. My young cousin changed his mind about pursuing CS in college because his HS course work focused too much on tedious details. He was not able to perceive what high-level programs are capable of doing and the power programming as a medium of creative expression. Its a big shame.