The present work is concerned with the classical Johnson-Mehl-Avrami-Yerofeev-Kolmogorov (JMAYK) equation. Some critical points are presented because this kinetic relation has been extensively misused. Various aspects regarding its failure when it is applied to recrystallization of plastically deformed metals are also considered. Recent conceptual improvements, such as the new approach where the transformation is described by the superposition of single JMAYK processes, have resulted in the resurgence of this approach.