Yes, it was that, but, still, there's a big and growing hurdle here that many similar efforts, with similar objective merits compared to contemporary SQL implementations, have failed to overcome, and not a lot of reason provided to think EdgeDB is better positioned.
> Why is it so hard to imagine something displacing SQL?
Because systems providing just as good solutions to largely the same set of SQL deficiencies have been produced and failed to displace SQL for a couple of decades.
The problem isn't doing better than SQL. It's doing enough better than SQL to overcome the depth of knowledge, experience, support, tooling maturity, and comfort people have with SQL. And that most gets deeper over time, on top of SQL getting internal mitigations, if not actual solutions, to some of the problems over time.
That said—as I’ve done with several before—I’ll probably download EdgeDB and try to do some stuff with it.