Regarding what is missing in Kotlin, my major hurd...
# science
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Regarding what is missing in Kotlin, my major hurdle compared to Python for example is the lack of good graphing libraries. There a several, but they only do really basic graphs or really low-level. I played a bit using WebView and libraries such as Cytoscape.js and Plotly etc, but it adds a layer of complexity (even if it somehow works).