[c7b]

Not the GP poster, but if you read some of the more recent research coming out of the groups that were originally founded by Facebook/Libra/Diem/Novi/whatever they call themselves this year, these actually do seem like substantial improvements eg over existing payment systems. Their papers (yet to be confirmed in live production systems afaik) report an order of magnitude capacity improvement over eg the Visa network (160k+ TPS vs 24k, at latency in the low seconds, or even subseconds).

For some of those systems, it would be a stretch to call them blockchains (there's no comparable data structure, sometimes not even consensus), but the important thing is that they come with peer-reviewed BFT security guarantees. So I do wonder, if you can have BFT guarantees for such a system, and still more capacity than you'll likely ever need, why wouldn't you?