It just dawned on me this is like the charger with the iPhone. Apple has data on how many ports are in use on the devices they ship. I’m sure they make a calculated decision to say 87% of users are fine with 2. If we give a premium config 2 more we can jack the price and justify. This will upset 3% of consumers but if they leave Apple over it, we are still positive cash by the premium sales.
Let's not forget that Apple was offering both two-port and four-port Macbook Pro 13" options long before Tuesday.
At this point they're still offering both options; the two-port is M1 and the four-port is Intel.
In the future I'd expect the four-port MBPs to transition to ARM as well.