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“for all” is also intended to quantify over a container at all points in time: whenever an object is added to or removed from the container being observed, event listeners are added or removed accordingly.
Indeed. Which means that said machinery implements a great deal of fidgety things we’d all love to abstract. But can/has it be/en done practicably?
I don’t think it has; that’s why I’m writing Hap. 
Basically, Hap = spreadsheets + equating variables with cells + executing code in response to changes.
I’ve heard good things about Rx <https://github.com/dotnet/reactive > but don’t know how similar it is. See also: FRP (e.g. netwire).
Rx is pretty obviously (in my opinion, as expressed in extant UI frameworks, with high uncertainty) a dead end. I think FRP has ideas yet to be mined profitably.
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