This is the third time I've watched this video (admittedly with a bit of distraction today). After the first time I went off and learned about modular implicits, which appear to be a huge ergonomic improvement, especially the way the JaneStreet library APIs are designed. The second and third times I got increasingly sad that so much brain power is being sucked up by algebraic effects, to the detriment of other advancements. Oh well, that's their decision to make; JaneStreet continues to do huge service to OCaml in myriad ways, and I really value these tech talk videos as part of that.
