PbP wasn't used back then because the minimum requirements to attempt the recipe and its ingredients left you with 3 CSII or 2 Standard Synthesis under Ingenuity II.

Best case with RS in any possible recipe is using 3 RS instead of 2 PbP and 3 CSII.
-Net gain: 20 progress, 48 CP
-Net loss: almost a 50% chance you fail, weaker BB due to no Innovation and 1 less shot at favorable condition

Other best case is 2 RS instead of 1 PbP and 3 CSII.
-Net gain: 20 progress, 33 CP
-Net loss: 36% chance of fail, weaker BB due to no Innovation

*If you want to fit BB and 2 RS under the same SHII and INGII, there's no room to also cram in GS and Innovation. Innovation is equal to 2½ more steps of Inner Quiet.