Absolutely no one uses the RF for the old Primals, literally only for Sophia.
I've queued up for the older Primals until RF hit the limit (999:59) and it was at 1/8 the entire time several times now.

Meanwhile, Ravana and Bismarck EX that are still in DF are frequently available.
So I stongly support having only the most recent Primal in RF and the others in DF.