They also have a limited headcount and resources so they wouldn't want to announce M1x/pro/max for all machines now and have employees be idle for the next 3 months.
Notebooks also have a higher profit margin, so they sell them to those who need to upgrade now. The lower-margin systems like Mini will come later. And the Mac Pro will either die or come with the next iteration of the chips.
Yup. Once I saw the 24" iMac I knew the 27" had had it's chips. 30" won't actually be much bigger than the 27" if the bezels shrink to almost nothing - which seems to be the trend.
