On Wed, 24 Nov 2021 at 08:16, Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp> wrote:

So, as modifying end systems is inevitable, there is
no reason not to support full end to end multihoming
including modifications to support multiple addresses
by TCP and some applications.

                                        Masataka Ohta

Are you proposing SCTP? There is sadly not much more hope for widespread adoption of that as of IPv6.