Reason to change developers

As a keen amateur I just don't have time to experiment in a systematic way between different film/developer combinations. I believe I get good negatives with a nice tonal scale using FX39(1+9)for Delta 100 and for Tech Pan (as a compensating developer@1+20 - one tenth the cost of Technidol!and no uneven development)and DD-X for Delta 3200. Is there really anything to gain from staining developers (which are pretty toxic)like Pyro and/or two bath/divided development? Am I right in thinking the only real benefit is a sort of contrast mask over the highlights, reducing the need for burning/shading at the printing stage?

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