People tend to focus on what has been left out, but think about what they actually did learn about:

Drafting from that pool, item and skill builds, last-hitting, creep aggro, laning in general, jungling, item and spell usage, ganking, team-fight positioning, pushing objectives, warding, map control, farm priority, when to retreat vs engage. All of these require an understanding of micro vs macro goals and how they relate.

Surely this qualifies as "a difficult task."