I find it interesting that the RAPAC subcommittee is now pushing for removal of FIA boundaries from charts, given it was RAPACs nationally who demanded that they be returned to the charts.
I recall their comments at the time, such as biscuits with no boundaries being useless, boundaries were far more easily interpreted, particularly the fact they aligned with an ATC sector's responsibility for that area including vertical limits for Class G and E comms.
The biscuits on current charts within FIA and Class E areas already include the outlet location, something introduced when the boundaries were returned way back.