Screw the lines atmo. The ranges you are referring to are likely the stepchildren of a generations long inane conversation that has been going on inside the pages of the cycling press. I have no recollection of ever having read an article in which design elements are intelligently discussed. Data point: I don't know that I would want the job or be any better at it. It's always this angle this and that trail that and all sorts of overgeneralizing about things writers have absolutely no fukcign first hand experience with. At least up until the industry was American-ized, one could find 'zines printed on the Continent in which the layouts of bicycles were detailed only in linear terms. Scan through enough of these and you'll wonder why the paradigm shifted.
Lose the protractors and stock up on tape measures and stainless steel meter sticks.
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