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Is there actually needed? Event handlers are usually just simple callbacks. You do not need coroutines for them, especially with builders like in TornadoFX.

Property are designed to avoid listening to change events directly. Anyway, listening with a flow, takes about three lines of code. You can probably contribute it yourself.

I agree, it may be useful, rective source is much more powerful if you combine multiple sources, filter, share etc

probably Alexander means that you just pass property to some ui component and shouldn’t listen changes directly

but still sometimes it may have sense, also expose Flow as Property would be nice

Usually, you just bind a property to another property. I worked a lot with JavaFX and It is quite rarely that I use raw events.

OK, I won't argue. Still it is very easy to add.

Well, it already has a module for that, so why not.