Thanks for that.

It seems that some newer languages (like in the last ten years) either care about (1) batch compilation speed or (2) language design mostly unconstrained from having to have fast batch compilation. It would be interesting to see a third way: language design that takes into account all kinds of future interactive tooling by laying a good groundwork. So maybe from-scratch batch compilation ends up slow, but then it turns out to be fine in practice since you can distribute builds and cache things so that you only pay at most a one-time large cost. And then what you mostly have to deal with is incremental stuff.