Having seen both a naive use of ReactFX and a more reasonable, we take the opportunity to formulate an advice for profitably using ReactFX. One should try to minimize the use of subscribe as this function is inherently side-effectful. Ideally, subscribe should only be used at the boundary between ReactFX and non-ReactFX code.
via: Eugen Kiss (2014): "Comparison of Object-Oriented and Functional Programming for GUI Development", http://www.eugenkiss.com/projects/thesis.pdf