That makes me assume you've never used Ansco 130.
The more accurate statement is that you haven't used D163 (without the errors of oral history misremembrance) and are assuming yourself more knowledgeable than the research teams of Kodak, Ilford, Agfa etc, all of whom could and would have used glycin in print developers, if it actually had any real effects visible in blind print testing. On the other hand, Phenidone and derivatives do have useful effects that are clearly visible, and can be exploited through optimal PQ ratios, and modified through powerful restrainers like 1-Phenyl-5-Mercapto-Tetrazole. If it had been necessary, these manufacturers would have outright synthesised specific developer components (and there's Ilford patents from the 1990s that hint rather strongly at possible reasons why the Harman Warmtone developer has not made it back to the market yet, and why the MSDS is a bit unclear).
It isn't particularly difficult to get what people with very limited experience imagine can only be possible with 130 with other developers using very conventional ingredients.
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