Bioshock 2. The forgotten sequel [Debriefing]

The first rumors and images related to Bioshock 4 have begun to appear on the Internet. This is a good reason to once again pay attention to this series, and to notice among the released parts the one that players talk about the least. Why did it turn out that after a year everyone remembers about the original and about Infinite, but the sequel seemed to never come out at all. Today we will try to figure this out.