<i>Web is almost entirely about I/O</i> — I think it's not quite correct, the web is half about IO and half about parsing, and parsing is where Haskell shines.

<i>Web is almost entirely about I/O</i> — I think it's not quite correct, the web is half about IO and half about parsing, and parsing is where Haskell shines. Haskell does not avoid IO because it's an unfortunate aspect, it avoids IO to simplify things, to minimize the surface that can break, to make it more easily optimizable to a compiler. "Pollution" is just an emotional term used in teaching beginners to emphasize usefulness and beauty of pure functions.