Gordon Hutchings also likes pyro for the high degree of separation between light and dark tones. Perhaps this is simply another way of saying what you described or maybe it is another reason.

This has been why I have used it. I use an Aristo 1212 cold light head on a Durst 138S converted to 8x10. I use Rollo Pyro in a Jobo, Ilford filters and Kentmere Fineprint VCFB. I have been very happy with this combination for enlarging 8x10 negatives and contact printing 7x17 for about 3, maybe 4 years.

John Powers