Also, I am not sure what counts as "in production" but on literally a daily basis I use about 15 different command line utilities I wrote in Nim using cligen [1

Also, I am not sure what counts as "in production" but on literally a daily basis I use about 15 different command line utilities I wrote in Nim using cligen [1] (EDIT: Really I have written several dozen but only about 15..20 are useful every day). There are always compiler bugs/things to workaround (as with any language), but Nim has been pretty usable for years. [1] https://github.com/c-blake/cligen https://github.com/c-blake/cligen