Nodes and wires UIs demo well but are hard to use in practice.

Part of the reason is that nodes and wires visualize the flow of information.

Flow is the most important characteristic, but it's necessarily abstract.

What users often want in practice is concreteness, like seeing a state object and how it was updated in a given invocation.

Users would rather reason in terms of state, with the flow being a secondary thing to understand if it doesn't update as expected, a set of threads to pull on to debug.

But nodes and wires UIs put the flow up front, with the state as secondary.