New M2 MacBook Pro and Mac mini suffer from same SSD speed issues as M2 Air

[iMore.com]

The new M2 14 inch Macbook Pro and Mac mini base models have slower SSD speeds than the previous generation M1. Full story from the iMore Blog...

 

[Up_And_Away]

Simply put, Apple is going with a single larger NAND (memory) chip instead of two smaller chips. So Instead of the read/write speed multiplied by 2, it is the speed of single chip.
The read/write speed remains fast. It is extremely unlikely to be noticed by a user (that’s not the bottleneck point) but it’s worth noting. If you get a higher disk space option, this option is built with 2 chips/double the speed.