Quote from Aaron Garbut.
"As the pressure for us on this project is huge, we dealt with that by doing our best to overdeliver,” Garbut says. “Normally you compromise scale for detail or detail for interaction, but with this project we went the other way – everything is dialed up – detail, scope, breadth, scale, interaction and density. I don’t think we have ever created anything close to this before." Remember Todd Howard famously said "as game devs you can do anything, but you can't do everything?" Rockstar really said "hold my 13 years and 2 billion dollars".