I have indeed used tri tone separation masks on some of my work. It is basically the same as dye transfer separation. And it does make luminous prints where there may be a need for masks to allow better control of the shadow/mid tone/ highlight areas of the print. But I still feel from all of the prints I've seen that it is still possible to get that same luminosity from a properly exposed and properly printed negative. It is the negatives with the extreme tonal ranges either too flat or too contrasty that welcome such masking treatments. If you propose to handle all of your printing that way, I applaud your efforts. I just don't think it is necessary for every one to be done with masks. But I have seen Lynn Radeka's work and love it. But I have seen hacks like me do work with just as much separation and luminosity as that. But it's your choice and your time.