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Generic services (in Editors/) typically do not have any position/ordering information.  Most languages are just indifferent to the order. Maybe it's not important for the function, or the  just do not define any order. I suppose that that the natural (declaration) order (textual order of appearance in the layer XML) is what the language implementation wantssatisfies the needs, especially if the registrations are written in the XML layer file. The . This language's assumption may break once an extension is developed, with specific needs for ordering. The important thing to remember is that some or mime-specific folders define order, but some do not.

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