I'm hoping some of the forced storyline line changes, so we can make our own scenarios and play.
In the old age of sail there was a large database of historical premade ships. Also it had numerous historical battles - I miss that.
I don't think we have that now (Just got the game) . We can choose a ship class but we then have to outfit it with guns etc. turning it into (Possibly) a fictional ship.
Some of the ship/battle research is already done in the first AOS I believe.
Even then we are forced to play a canned scenario instead of just making one up from scratch, picking map, date etc.
In a game like this we need the flexibility to do/create what we want.
Having a historical open world would be great where we can join a navy as a master and commander and cruise and or do missions but to do that historically would be a ton of work and research. Letting us create as we wish would be the next best thing.
As to the gameplay I would put it down as a WIP.