Is there a place in the blog series where the async requirement is expanded on? Is it just the desire to transparently have Dark code use async IO so it's cheap

Is there a place in the blog series where the async requirement is expanded on? Is it just the desire to transparently have Dark code use async IO so it's cheaper / can be said to be very scalable? edit: in https://blog.darklang.com/adventures-in-async/ https://blog.darklang.com/adventures-in-async/ there's a short clue saying "The Dark web server is currently synchronous, and so long or slow requests--at sufficient volume--can cause operational issues for us" but it doesn't go into details.