[mindcrime]

Do you re-try that part and risk sending the same instruction twice (ok in some cases but not all) vs risk of having sent no instruction?

If you can make your compensating action idempotent, then yes, you can just keep retrying it. If it can't be made so for whatever reason, then a failure at that point demands manual intervention.

[scruffups]

I suppose redundant communication channels (that go over different network modalities, e.g, data center native, satellite, 5G, etc) can be used to recover from network partition. Still, having a protocol with at-least-once delivery guarantee is important as it assures that no messages are lost due to unexpected crash of sender/caller or receiver/callee.