Granted 7nm and chiplets is such gigantic step i havnt seen similar the last 30 years
What do you mean by this?
To me the IO die is basically what the old school Northbridge used to be back before A64 and Infinity Fabric is a fancy FSB. It seems like the Zen2 chiplets are essentially what CPUs used to be before they were packaged with additional IO.
It is on old idea updated and is very useful for maximising the advantage of newer nodes without having as large a yield penalty but I don't see it as a gigantic step.