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Why are almost all operators on Channels marked as obsolete, but the simple ".map" is not?

Because they will be replaced by Flow
<https://github.com/Kotlin/kotlinx.coroutines/issues/254>

Also
<https://github.com/Kotlin/kotlinx.coroutines/issues/285>

But does it mean it's safe to use simple .map() on channels? Or should I replace Channel with Flow if I want to use .map()?

Yes, better to use Flow, but it experimental

&gt; safe to use simple .map()
Depends on what you mean by “safe”, most probably this API will be deprecated and removed one day