This is the section of the article that I was referring to. It is quite possible that I am misunderstanding what he saying though.
WT: I see PipeWire as a much lower-level framework to move data around between apps and devices. It’s very good at handling raw audio and video and interfacing with devices. It’s not so good at muxing and demuxing and it does not want to do some of the higher level multimedia tasks such as implementing an RTSP server or handle transmuxing formats. GStreamer still remains ideally suited for those higher level tasks, muxing, demuxing, encoding, decoding, etc.