True Tone LED Flash on iPad models

Are there any plans to add flash to all iPad models in the near future? I own an iPad Mini 6 which is only one of three iPads equipped with the feature (Other ones including the 11-inch and 12.9-inch iPad Pro models). And why is it that only the Mini gets Flash and not the standard iPad 10th gen or the Air? All three of them has the same design. I believe LED Flash started appearing on iPads starting with the iPad Pro 1 which was released back in 2015. Does anyone know why there is Flash on select iPad models and not all?