They also went from thunderbolt 4 back to thunderbolt 3 in many of the options… I mean the bandwidth is the same but why downgrade the version? What’s going on at the physical layer?
The bandwidth isn't exactly the same. It's a bit more nuanced. OWC has a good writeup of why they don't make Thunderbolt 4 storage, only docks. https://www.owc.com/blog/whats-the-difference-between-thunderbolt-3-and-thunderbolt-4