It's just for higher settings (4k textures) so running on lower end hardware is irrelevant.
But now that I look at the exact difference in size, 84GB for PS5, it may just not be compressed at all (modern game compression is often around 2x).
Probably a strategy to lower CPU requirements, but a shit stupid one. Far more people will be put off by a 190gb install size, especially as people without the CPU grunt will also likely not have the drive space at the same time.