This game should have been built from ground up for next gen. Limitef gpu/ cpu/ram/hard drive. Thats why u see less npcs and copy paste of street/neon signs.
Come again?. The have been 3rd party open world games that have had less npc's etc on console versions but have had options to have more on pc, so this is totally down to the developer if on release the isn't many npc's on the streets on pc and next-gen versions as other games have done it (But then mod on the pc version will most likely fix it if that's the case anyways). As for the street signs, if you think all next gen open world games are going to have different signs and posters etc on every street your mistaking that's nothing got to do with the hardware and more to do if the developer wants to put in them details. PS1 games etc could of had different signs everywhere if the developer wished to put in that much detail.