However, demonstrating that Apple can keep the ball rolling with AS, for Mac is important in the same way that creating new A-Series SoCs for iPhones & iPads is. If Apple doesn't release new M-series chips at least every 18 months, they run the risk of being seen as slow to introduce new developments, which might also be seen a sign of problems with the designs. Apple doesn't want to receive the same accusations of lack of innovation that were levelled at Intel.
Who in the heck came up with the notion that ARM processors need to supersede each other every 18 months? We are no longer live with intel Moores Law.
Apple almost never releases a lot of different Macs categories all at once. Since the November 2020 announcement Apple has been rolling out AS products every six months that don't really compete against other AS based products.
The way Apple approached this. Provide a Mac mini with a A12X (DTK) to test native compatibility with software applications.
Next they introduce first ARM made for a Mac the M1, they put it in 3 similar designs, the 13" MBA, its very close to same design 13" MBP and obviously a Mac mini which was the original developer test bed. The point of that is to give greatest increase the exposure to ARM based Macs used by consumers for developers to garner feedback with universal or native software applications. There was a lot of learning and these Macs were not as complicated as what was coming.
6 months later they introduce a total redesign of a 21 intel iMac with a M1 24" iMac, and because of where they were in-between A14/A15 development they used a M1 in the 11", and 12.9" IPad Pros.
6 months later, Apple announced the M1 Pro and M1 Max and showed off the totally redesigned 14" and 16" MBP's that use them.
Notice that with each product release grouping Apple is selling products that are in separate selling brackets, not to alienate consumers that bought earlier products. Also notice that the AS computers involved are ramping up in performance capability.
Here we are looking at a April/May timeframe of the redesigned 27" iMac and possible a M1 Pro or M1 Max based Mac mini to expand the AS Mac lineup.
Later in June to Fall you have a Mac Pro using multiple M1 Max SoC's sometime.
The way Apple has been releasing Macs falls into a pattern, its not based on showing the marketplace that its can quickly update AS SoC's like those commodity like iPhones , its more about scaling up what the AS based Macs can offer to creative types, and also pursuing development of the macOS Monterey and what comes after to improve their performance.