Thunderbolt 5 isn’t available yet, and in any case will probably offer no more than 6 GB/s. So what is the way ahead for Apple in its successors to its M1 series chips?
Fundamentally a combination of PCI Express and DisplayPort, with substantial power supply, there are several reasons why you won’t get the whole 40 Gb/s from external storage.
Out with USB 2 and in with USB 3; out with FireWire and in with Thunderbolt, then Thunderbolt 2. But which should you choose to use, and how?