For sea zones with no connected territory, I am fine is it in this discussion at 2).
I am wondering if it might actually be reasonable to extend that to all sea zones.
If amphibious assault if your worry, you still need to secure sea zone before landing anyway.
EXAMPLE 1
Round 3 Axis
Japan has CV (carrier) at SZ 55.
Round 3 Allies
US builds CV at Western.US.
Combat do not occur yet.
Round 4 Axis
Japan must move CV out of SZ 55 or combat occurs…which gives US defender advantage.
Should US get the advantage? Why not Japan (who’s camping at SZ 55)?
EXAMPLE 2
Round 1 Axis
Germany builds IC at Western Europe.
Round 2 Axis
Germany builds Carrier at SZ 7.
Round 2 Allies
UK builds Carrier at SZ 7.
Round 3 Axis
Germany must move Carrier out of SZ 7 or combat occurs…which gives UK defender advantage.
Even though UK Carrier is the late-comer and the German Carrier is well established already.