Reasons that people were forced to move from Elm to something else?

[rupert]

@solificati

On the other hand, Elm type system is limited and we can’t express our domain through it. Our apps deal with complex information and we’d like to have more tools at our disposal than records and tagged sums. We’d like to enforce laws and relations between data, even if we need to pay with steeper learning curve.

I am curious about this, if Elm did not fit your needs here, what did you use instead that did?

Also, what is the domain we are talking about here?