For the sake of efficiency, [let’s just revert to representative democracy]

I think that's pretty reductionist to the argument I was making. I was arguing (with a long list of concrete examples) for why I think the system you're outlining will either inevitably revert to representative democracy over time, or be incapable of working at a large (millions of people) scale. I'm not saying that none of what you said has merit, or that the form of representative democracy we work with today is the optimal system.

I think both of us (and anyone that has worked in a system where groups send delegates to super-groups to represent them) is familiar with the concept that our group decides on boundaries for what we think are acceptable decisions, and then gives our delegate a mandate to come to an agreement within those boundaries. The simple reason is that negotiations take extremely long if every iteration needs to go up and down the entire decision chain, so the negotiators (delegates) need some kind of flexibility to come to an agreement. I provided plenty of examples of situations where this is applicable.

To be honest, it seems a bit to me like you might have a slightly narrow view on what "representative democracy" entails. I would argue that once you have a delegate representing your interests with any kind of leeway to make decisions (that is, they're actually a delegate, not just a messenger), you're working with representative democracy. You can have a wide range of ways to decide who the delegate should be, how broad their mandate should be, and how long they function for. However, if the delegate has any kind of mandate outside of being a messenger, I think it stands that you're electing (choosing one person from a group by consensus is a form of election) a representative to represent your interests, and thus have a representative democracy.

I'm the first to admit that power can corrupt, and that any representative democracy should have solid mechanisms in place to prevent the emergence of a "ruler class" (which most representative democracies today have in some form or other). Doing stuff like limiting the duration and length of terms is of course one option. At the end of the day, it largely boils down to a tradeoff between efficient management vs. direct involvement of everyone affected. Like you said, the most efficient decision making system is probably a dictatorship, but at that point we've tipped over into the opposite ditch (no involvement from the people affected).

For the record, I'm not the person downvoting you :)