Not a lot of mention for the collaboration aspect that local first / sync engines enabled. I've been building a project using Zero that is meant to replace a Google Sheet a friend of mine uses for his business. He routinely gets on a Google Meet with a client, they both open the Sheet and then go through the data.

Before the emergence of tools like Zero I wouldn't have ever considered attempting to recreate the experience of a Google Sheet in a web app. I've previously built many live updating UIs using web sockets but managing that incoming data and applying it to the right area in the UI is not trivial. Take that and multiply it by 1000 cells in a Sheet (which is the wrong approach anyway, but it's what I knew how to build) and I can only imagine the mess of code.

Now with Zero, I write a query to select the data and a mutator to change the data and everything syncs to anyone viewing the page. It is a pleasure to work with and I enjoy building the application rather than sweating dealing with applying incoming hyper specific data changes.