I would check out https://github.com/reflex-frp/reflex https://github.com/reflex-frp/reflex which is truly a godsend for concurrency but actually uses loads of

I would check out https://github.com/reflex-frp/reflex https://github.com/reflex-frp/reflex which is truly a godsend for concurrency but actually uses loads of mutation internally. Haskell helps loads here but the mechanisms are a lot more complex and nuanced than the circa 2000 ideology you were saying.