Well here's a major negative - you can buy manpower in this game. As I recall, you couldn't buy manpower in either Tesla Wars or CoW, which put a brake on cash gamers. But in this game you can buy as many combat units as you can afford, which obviously puts players with limited means at a potentially big disadvantage.
When I think about, the scarcity of resources in both CoW and IO is probably there to tempt users into spending $$$ to buy more, since it doesn't make any sense purely in game terms.
The whole "new" system is designed to get people to use gold and spend money. Everything is based on that. Every investment I made in Supremacy 1914 is gone, gold was supposedly adjusted, but with everything so slow it is highly devalued. All rank and accomplishments are also, just gone.