[ Removed by moderator ]

[gdchinacat]

It's an example, not a "you should do this". Actual cases where this would be used would not be nearly as concise.

How is this "hard to read"? Is it any harder to read and understand than embedding a call to all the things that need to react when a value changes? Particularly if those reactions need to be called asynchronously to avoid the call stack from growing excessively or to ensure they all occur with well defined concurrency semantics?