A lot of young people have never in their lives seen an actual paper file, a manilla folder, and their "desk top" is where they put their monitor stand. These things were made skeuomorphic to ease office workers' transition from paper filing to computer filing. Kids today have no idea what the physical counterparts are anymore, just like they have no idea why "save" icons look like floppy disks. It's all anachronistic.
Kids in the 90s had never seen an actual paper file nor a manilla folder either, yet they managed to learn file system concepts. Skeuomorphism is valuable when designing UIs but was never that important for teaching computer concepts 30 years ago.
