That's because none of these others do have same tech Face ID like iPhone. They usually have one camera here and there, which they make it like a hole-punch or some hide it terribly under the display (awful) or some mechanical camera pop up, which they have already abandoned the idea now. These companies could come up with mediocre solutions and no one would give a damn. But Apple simply can not do that. And Apple does not play by the same rules these other companies play. Apple waits for the tech to mature while others compete who would be the first.