Of course it's BS. Throw away your calculator and actually print all these film for forty years like I have! The graphs are useful, but only when
the playing field is perfectly level; and the whole name of the game in the darkroom is to skew the variables. A particular black and white neg
which might appear sharper in a 16x20 print versus its color counterpart might see the apparent result switched in a 30x40 magnification, for
example. There are all kinds of ways of tweaking these things, and I'm not referring to digital manipulation. Sometimes a grainier film appears
sharper than a fine-grained one, sometimes it doesn't. It can even depend on which dye layer of a color film is predominantly exposed. We could talk for hours and hours about this. Those of us who cut our teeth on Kodachrome 25 thought the 64 version stunk. It's all relative.
But if detail is a priority in color, take a look at Ektar. Otherwise, shoot a larger format (I do both).