Agreed Terence. However, hashgraphs means stepping into private, permissioned ledgers.. And certainly permissioned ledgers provide you with an alternative way to reach consensus. However, that consensus is based on knowledge of the participating nodes (no true anonymity of nodes is possible).
With public blockchains, therein lies the true power — anyone across the globe can be a participating node and yet, consensus is reachable using a common Proof of Work mechanism. Not so with hashgraphs.
As can be expected, with private, known nodes, transaction speeds can be as high as possible (just like with central databases). Which is what makes hashgraphs super fast compared to public blockchains.
Thanks for the comment and your observation is astute. I will try and clarify the distinction in a future update.