Maybe? Isn't WebSockets basically TCP? Roughly? I wrote that WebSockets provide reliable bi-directional streams, but it actually doesn't. It implements message framing. WebTransport also doesn't support "unreliable streams", it's actually called "datagrams". WebTransport doesn't even have to be used over HTTP/3 per the latest spec, so is it basically WebSockets reimplemented in HTTP/3? No.