Purescript's Argonaut lib has major performance issues that are incurred for the "powerful type system."
When you only have thousands of items in an array, you end up with performance discrepancies between older browsers like IE 11 and Chrome that are unacceptable outside of a toy application.
Maybe if you've been fortunate to have attended an elite school. For the rest of us no name state school alumns, there's the nice illusion of meritocracy either way.