I don't think the M1 Pro can push a 4th TB4 port anyway. Only the M1 Max chip has the guts to push 4 TB4 ports... making different chassis for different CPUs (Pro vs Max vs 14" vs 16") would be expensive.I'm more annoyed at the folks clamoring for these ports cost us a TB4 port for an HDMI port that won't run my screen.
I skipped the new Mini because of this as well.
also, these are listed as Thunderbolt 4 ports vs listed USB-C 4 ports on the M1 Macs. TB4 is the "best version" of the TB/USBc ports being sold right now. So that's a cool thing.