Why do mods for non-FC planes replace the original aircraft?

[The_Chugster]

All the mods based on FC planes exist as separate aircraft but mods based on full fidelity planes, such as the Super Hornet or F-16 SUFA, replace the base model?

[The_Chugster]

Anyone?

[SkateZilla]

SuperHornet and Sufa dont replace, they augment themselves into the core files because they need the System and Flight Model DLLs.

FCS Aircraft previously were handled different.