Because in those two years, we get exposure to how a squadron runs (from a spectator perspective. We play a minimal role). We stand a lot of duty, so we are at least mostly prepped for that in the fleet.
We have a GENERAL understanding of how the departments run (or at least what they do): Admin, Safety/NATOPS, Training, OPS, Maintenance, etc. We may have a 10% understanding of what really goes on behind the scenes, but we have a bit of direction and mostly get the big picture.
Whaaat? Try 1%. SDO/AODO (i.e. human phone directory and firewatch) and no shit ODO are night and day. Civilian clerks and contract maintainers don't exactly make for a honest picture of how a squadron runs. ("Whaddya mean I have to do my own travel vouchers? WTF is DTS?")? I feel like I know 10% at the RAG, at least to realize what 90% I don't know. And even then there are some pretty significant differences between a RAG and Fleet squadron (S-2? What's that?). The RAG is getting us pretty well spun up on ground jobs, so I think the end result when we hit the fleet is still superior, since it's 6 months of prep for the ground half of your job.