This may be a perennial issue with functional langs, but using a functional lang only made sense to me after working with OO problems for YEARS. You'll see qui

This may be a perennial issue with functional langs, but using a functional lang only made sense to me after working with OO problems for YEARS. You'll see quite a few people commenting in this thread (including me) who have spent something like 10-15+ years working with OO languages, we've seen the ugly sides of mutability, dependency spaghetti, holding onto state too tightly, too much coupling between classes, and the like; not to mention the difficulty with concurrency in a world where anything can mutate global state (such as class definitions).