This is a fantastic project and I can't wait to try it out!

One question on the network requirements. The web page says for networking: "200 ms or less, 50 Mbps or more".

How hard are these requirements? For folks like me that can't afford a guaranteed 50Mbps internet connection, is this still usable?

There are plenty of places in the world where 50Mbps internet connectivity would be a dream. Even here in Canada there are plenty of places with a max of 10Mbps. The African continent for example will have many more.