It does more of the heavy lifting automatically. For example, rather than having to explicitly build a data structure to keep track of events that have happened, or build some message bus to receive and react to them, Eve allows you to express the fact that you want to react to them, and its runtime takes care of the rest.
How well this scales and remains available, well, that's an implementation challenge, but the user interface looks very convenient. It is potentially a higher level of abstraction over current "high level programming", just as high level programming was over assembly.
What you describe is normally handled by any number of perfectly good libraries. The selling point here seems to be "we've thrown a bunch of random libraries together in the standard library", which isn't a super compelling argument to me.
Could you share an example library or framework that allows a programming model similar to what they demonstrate in the video? I'd like to learn more.
I am aware of frameworks that can pass information around in similar ways, but only with a lot more ceremony of the sort that's not necessarily a benefit. Observe specifically the code blocks with "search" that react to events without needing to be connected in any direct way with event production; and event production doesn't need to involve data structures or storage.
Maybe this model won't work in applications of meaningful scale, but maybe it will.
How well this scales and remains available, well, that's an implementation challenge, but the user interface looks very convenient. It is potentially a higher level of abstraction over current "high level programming", just as high level programming was over assembly.