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Or just have multiple TCP streams. Super simple, low cost, uses all the optimisations we have already.

when the latency/packet drop is low, prune the connections and you get monster speed.

When the latency/loss is high, grow the number of concurrent connections to overcome slow start.

Doesn't give you QUIC like multipath though.

There’s Multipath TCP.

I mean there is, but from what I recall its more a link aggregation thing, rather than a network portable system

It seems to support failover smoothly over various links.

Interesting article about combining starlinks, 4G + 5G to single mptcp that works on the move: https://dillonbaird.io/articles/mptcpbonding/