Much or little Metol?

I've seen many recipes for developers. Some contains 2-4 grams of Metol and others use 7-10 grams. Same with Glycin. I like Agfa 8 that contains 2 grams Glycin, but some recipes use 10 grams or more. What's the point of using more of the developing agents? Is it that the developer can be used longer, or does it affect the results?

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