A agree in a way that I am also not a fan of the many "great results with stupid C41 modifications"-threads on APUG.
But: C-41 is usually a constantly running machine process with a seasoned developer, defined replenishment, nitrogen burst agitation, and complex process monitoring. Home processing C-41 will always be just a rough approximation (at best).
There is no guarantee that any of these home processinjg kits are anywhere near the official C-41 formulation. In all likelihood most of them aren't unless you are using Kodak's Flexicolor.
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