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I thought similarly until I committed to working on an Elm project.

I developed an open source game in Elm, and I've been very impressed with the benefits of the pure functional approach. It takes some getting used to, for sure, but it makes things really simple to reason about once you get used to it.

There are definitely rough edges still: Elm in particular is just missing a lot of stuff, but I was surprised how much value the pure functional approach gave me.