There is also a more general "case against the self-indulgent narcissism in creating a new language". There are an insane number of languages with the longevity of a mushroom mentioned on HN.
There's an oversupply of enthusiastic engineers trying to provide C alternatives and it's creating massive bike-shedding and yak-shaving problems.
Language designers are encouraged to give a presentation if it's about building quality software using a language. Otherwise, no.