AFAIK USB4 now mandates Thunderbolt's Type C altmode.
That was Intel's concession on blocking PCI-E 4.0: they wanted to mandate Thunderbolt over Type C as the official external PCI-E interface in enterprise, when the entire industry went with OCuLink instead, due to actually being enterprise-grade (it uses the replacement of the SFF-8644 (multiuse, commonly called MiniSAS HD), the SFF-8611; some mobos use SFF-8644, and SF-8644<->SFF-8611 cables exist) whereas Type C is not.
When they got their way with USB4 mandating Thunderbolt, PCI-E 4.0 finally was ratified several years late.... PCI-E 4.0 is now so late because of Intel's ridiculous tantrum that only two generations of PC will use it, and the world is proceeding directly to 5.0. Some products have already only exist in 3.0 and (soon to be) 5.0, skipping 4.0 entirely.
That was Intel's concession on blocking PCI-E 4.0: they wanted to mandate Thunderbolt over Type C as the official external PCI-E interface in enterprise, when the entire industry went with OCuLink instead, due to actually being enterprise-grade (it uses the replacement of the SFF-8644 (multiuse, commonly called MiniSAS HD), the SFF-8611; some mobos use SFF-8644, and SF-8644<->SFF-8611 cables exist) whereas Type C is not.
When they got their way with USB4 mandating Thunderbolt, PCI-E 4.0 finally was ratified several years late.... PCI-E 4.0 is now so late because of Intel's ridiculous tantrum that only two generations of PC will use it, and the world is proceeding directly to 5.0. Some products have already only exist in 3.0 and (soon to be) 5.0, skipping 4.0 entirely.