3.0 wasn’t the speed or the feature. It was an engineering spec with a lot of features, optional and required. 3.1 took 3.0’s features and added more optional

3.0 wasn’t the speed or the feature. It was an engineering spec with a lot of features, optional and required. 3.1 took 3.0’s features and added more optional features to make a larger document. 3.2 likewise. You are likely thinking the actual feature marketing names. Things like USB-C connectors and Superspeed 20 Gbps. These do not change release to release. They also might require conformance testing to use those names. I actually blame the current mess on PC motherboard manufacturers for wiring up a crapload of non-conforming ports, like a “USB-A Gen 2x2” with a red plastic tab. IMHO thy did this because nobody wanted to take the risk of actually pushing toward USB-C. It left them without a way to use a certified/marketing name, hence pretending engineering names were appropriate.