My guess is that logics has nothing to do with the problem. Of course they should be the same as RR spells, the problem is in the game code they have nothing to do with each other. Blue prints are old, they were coded a long time a ago and they were never meant to even stay in the game, it was kind of a thing they tested (doesn´t even have a real name! if I remember correctly they were going to change the name to something more fantasy style in the final version) and then just never got finalized. By now they are so embedded in our economies they can´t be changed anymore without major trouble, as you may remember when RR spells were introduced. First they were going to substitute blueprints with RRs (at was it 10 for 1?) But people hated it so instead they kept the blueprint and added 5 RR to tourney rewards. Btw another huge increase in tourney rewards back then without any additional work for it.
So basically blueprints are relic code that isn´t even really supposed to be there. And that is why they don´t feel like spending tons of time to make blueprints fit the new game now. It would be very small benefit to the game (a little added convenience) for a lot of investment. So I doubt it will ever happen. They spend their time on stuff that they can actually sell...