There really isn’t anything else to grasp other than the simple truth that the ssd is slower than its predecessor. This isn’t rocket science, so there’s nothing that Ritchie or Linus or anyone else needs to tell us.
The only entity that has any explaining to do here is Apple. Especially in this day and age where pcie4.0 nvme storage is readily available in the market at affordable prices, and we’re on the cusp of pcie5.0 nvme storage, which will launch later in 2022. 12,000 MB/sec is coming soon. Alder Lake/Raptor Lake and Zen 4 systems will be able to take advantage.
I mean it is still much faster than sata storage, but at 1400 MB/sec, it’s not even utilizing 50% of the available bandwidth of last-gen pcie3.0 m.2 storage, and even less of the pcie4.0 bandwidth that’s available in current gen laptops and even MacBook Pros.
A Samsung 980 pro or Western Digital SN850 will net you close to 7000 MB/sec read and 5000+ MB/sec write. Apple really has no excuse to be offering slower SSD speeds than the predecessor, without offering a commensurate decrease in price. This is unacceptable.