Not only is it nearly as high as Haskell, the PureScript guide hasn't been updated in years and is wildly out of date. You have to go searching for an unofficial rewrite, and those are incomplete as well.
Also, these days no one want to learn Haskell just for sake of building UI. Just do it in JavaScript or TypeScript, far far far easier pill to swallow.
Yes I learned Haskell, Elm, and Rust