Definitely did not come across as a rant to me, I think we’re all happy with your feedback and it highlighted that we need more discussion, so thanks for raising this.
So as @free explained one-way calls were never reliable. We are thinking about a solution to both get reliability and ensure that you can always update your canister, with named-callbacks. You would still upgrade your canister without stopping (like Joachim also suggests with one-way calls), so upgrading always works. But now that you have valid (named) callbacks, you can actually make things reliable, eg by retrying in the callback if you get an error back. Note that this allows you to build reliable communication, because there is a guarantee that the callback will always be called for every call.