I think a lot of PS1 era JRPGs had some amount of it, it was just often buried and not explained. Even FF7 had an entire complex system for a throwaway romance sidequest that spanned the entire game up until that point.
Heck the Star Ocean 2 romance value system spans the entire game and is incredibly complex with its interactions, though it doesn't do a whole lot as a gameplay integration.
Unfortunately it seems the PS1 era is when that kind of thing ended because my knowledge of anything like it ends there.
I think a lot of PS1 era JRPGs had some amount of it, it was just often buried and not explained. Even FF7 had an entire complex system for a throwaway romance sidequest that spanned the entire game up until that point.
Heck the Star Ocean 2 romance value system spans the entire game and is incredibly complex with its interactions, though it doesn't do a whole lot as a gameplay integration.
Unfortunately it seems the PS1 era is when that kind of thing ended because my knowledge of anything like it ends there.