Greed is why they stagger releases. They expect an insane amount of people to buy it both on console and pc. They just want to double dipp on as many idiots as possible.

Did anyone expect this game to be released at the same time for consoles and PCs?

Rockstar has literally never released a GTA game simultaneously on both platforms. The PC release has always been delayed by several months if not years.

The simplest explanation to me is that this way they get to double dip, since there will be people who buy it on Playstation, who will then also buy the PC version.