I have a feeling Apple's sales of the M3 family, base to Max, are not doing well, or not as well as the M1 and M2 lines. I've never seen Apple discount machines as quickly as they have with the M3 line.
The last powerful Mac that I bought was the 2019 Intel MBP and boy do I regret that decision. I was planning on upgrading to the M3 Max MBP but the rumors on M4 Macs started coming out.
One of the main reasons for me is WiFi 7. I bought a WiFi 7 TP-Link router a few months back and it has already increased performance on my older machines. Here's the speed on my 2020 M1 Macbook Air:
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I'm waiting to see what the speed will be on a Mac that actually has WiFi 7. Performance wise, I think the M3 Max is more than enough for me.
What would make you want to upgrade to the M4 line, especially if you're already on M1 or M2?