This is apparently ported from the PC not PS2. I can’t think of any particular features that would be challenging due to platform differences, except for streaming open world data from disc instead of harddisk.
I hope this is a joke, considering I literally mentioned in the post: Save files sizes are substantially larger, world draw distances are greater, textures tend to be higher resolution, etc.
It was in the same sentence as it being a port from PC :>
My reply was to a post that talked about PS2‘s strengths.