The real argument about Transport Stream isn't its age but unnecessary overhead. If backwards compatibility is more important than overhead, fine. But acknowledge that there is a tradeoff.
Related: "MPEG-2 Transport Stream Packaging for Media over QUIC Transport (ietf.org)" 07.may.2026 https://news.ycombinator.com/item?id=48049963 23 comments
Graduated from college and day one in my first real job, I was handed a hardcopy of the MPEG-2 transport stream spec and told to read it and come back with questions.
That's how you onboard.