Anders The tuning curve and deviation curves are a means to validate and fine-adjust a tuning, and to quickly determine before tuning, what result can be achieved with a given instrument. Most hobbyists tuning their own instruments won't need that information and most don't want to deal with the complexity involved. To visually check for coarse errors, you don't need the tuning curve, as the inharmonicity curve has all the information you need. If the IH curve is fine, the tuning curve will be fine as well.
