@baron-Münchhausen One of the main reasons why people have not been buying battleships is that cruisers are just better for the price. The fact that they move one more space than any other naval unit is huge. They are much better economically since you get more dice power per IPC spent than you do on a battleship. Yes a battleship can take two hits, but you have to pay to repair. I would much rather have two cruisers and pay a small amount extra than 1 battleship.
Historically, this makes sense. Battleships were on the way out in terms of being the central feature of the modern battlefleet. Carriers were taking over.