sumitagarwal
Inspired
I agree with this. Like many things with guitar its about nailing a particular "moment" in guitar. See also: cranking Master Volume to sound more like a time before separately adjustable preamp gain.Actually, I think that is NOT the answer. The answer AFAIK is that in the 80s guitars were getting all these effects added to them in studio recordings AFTER not only the power amp but also the cabinet/mic/etc and the WISH was to emulate that studio sound on the road.
So, historically at least, guitar amp FX loops are a compromise and the request in the OP is like to emulate that compromise when the ideal studio like chain is readily available and simpler to use.