Yes, that's correct. In the Linux kernel, it would not be possible to switch to MPTCP by default. But apps can use it by default. For the server case, it reall

Yes, that's correct. In the Linux kernel, it would not be possible to switch to MPTCP by default. But apps can use it by default. For the server case, it really makes sense: https://www.mptcp.dev/faq.html#why--when-should-mptcp-be-enabled-by-default https://www.mptcp.dev/faq.html#why--when-should-mptcp-be-ena... GNU/Linux distributions could even switch MPTCP on by default (via eBPF).