The language features in question are, to my knowledge, unrestricted JS FFI and adding infix operators. Banning the former completely removes a whole class of s

The language features in question are, to my knowledge, unrestricted JS FFI and adding infix operators. Banning the former completely removes a whole class of security vulnerabilities. Banning the latter means you can't be as terse as you want but new authors in a codebase don't have the problem that new authors in a Haskell codebase can have. So they're both tradeoffs.