Why submarines and carriers complicate warship design games

Could Ultimate Admiral: Dreadnoughts support player-designed submarines and aircraft carriers?

Submarine design would be interesting, but carriers create a deeper modelling problem because the aircraft and their design must also be represented.

Very large fleet submarines make a player design system attractive. Carriers are harder to add because their combat value cannot be represented by the hull alone. A carrier feature would also need to design or otherwise model the aircraft that deliver its striking power. The carrier, air group, and mission system have to be represented as an interdependent weapon.