Kh, Gh, and Qaaf: Three Guests Who Stayed
Three consonants that arrived with Persian and Arabic and never left.
Three consonants arrived with Persian and Arabic and never left: the fricatives x (ख़ خ) and gh (ग़ غ), and the uvular stop q (क़ ق).
In careful speech they remain fully distinct from the native kh, g, and k. In much colloquial speech they have merged with their nearest neighbors, so qilaa becomes kilaa, ghazal becomes gazal, and khwaab becomes khaab with the wrong kh.
Whether a speaker keeps them tells you about script exposure, schooling, media diet, and identity. None of the variants is a moral failing; each is data. Mapping who keeps which guest, and where, is exactly the kind of story Zubane exists to tell.