it means that you cannot just have historical cities. You MUST have a normal city too.
So basically players will exploit this to have untakable cities porting around. They can port a normal city into a state, and provided they have ONLY HCs as their other cities they are safe from total loss.
Its not a big deal really.
Now how about some of the bugs in age1 being fixed some time this year.
Scythe on S3, W12, etc.
Scyther S128 Retired..
Scythe NA4 Retired..
RuinUrDay S146 (Retired).
+REP me if I helped you.