Most likely because the bottleneck for loading was somewhere else when they tested it originally quite likely the slow HDD of the consoles of the time. GTA V c

Most likely because the bottleneck for loading was somewhere else when they tested it originally quite likely the slow HDD of the consoles of the time. GTA V came out 8 years ago, it had to run on the base PS4/Xbox One not to mention the PS3 and 360 these were the systems it was first validated on. It also had much much less content at the time. As the game released on PC and the amount of content grew the loading times didn’t regress but they also didn’t improve. So when your benchmark is a console that loads a game in 5-10 minutes no one probably spent any time investigating what the bounds on a modern PC with PCIe storage should be.