Apple’s chip release schedule is so borked. It should be High end Pro and Studio first and then iPad, Air, Mini and downgraded Pro. Why they release the iPad and Low End Pro is beyond me. Everyone buying their high end gear is buying something waiting to be refreshed now.
AMD is somewhat of an exception/unique case though, having chipsets and monolithic depending on the use case and console/semicustom offerings, so that doesn't map fully.
Also, let's not forget in Apples case, that they actually go phone first, the Air+iPad, then Pro and finally Studio. Feel that the lower end devices should priority personally though, efficiency gains are more valuable in connected devices with limited space for batteries over my 16 incher with 100wh.
Course, would be nice if we just got the entire range updated at once, but I doubt even Apple could pull such a supply chain miracle off, even if they bought all of TSMC and the entire island to boot...