I have never used Rx libraries. What are the cases where you have low friction coroutines such as loom (no "coloured" functions afaik) where you want to use RxJ

I have never used Rx libraries. What are the cases where you have low friction coroutines such as loom (no "coloured" functions afaik) where you want to use RxJava? Handling backpressure? Modelling complex flows? Honest question