It was ugly. And then do-notation arrived in around 1999 (I think - I'd be super happy if someone can find a precise year for me) and it became a solved proble

It was ugly. And then do-notation arrived in around 1999 (I think - I'd be super happy if someone can find a precise year for me) and it became a solved problem. Just in time for people to ignore it and start complaining about the ugliness of flatMap from 2015 onwards.