Next livestream is tomorrow and I will be demoing some programming techniques you cannot do in other programming systems, so it should be very interesting to a FoC crowd https://observablehq.com/@endpointservices/meetups
In particular with Observable I am able to unroll a function over data flow cells. Freeze data in time, and iterate on solutions thanks to live code reload.
In practice this means you can start coding from a server stub, in data processing order, on live data, without ever restarting or waiting for a new data point to arrive. You don't need to hunt in vendor documentation for schema definitions because you are coding off reality. Its very nice