I worked on a construction app that was offline first, and let me tell you the reason why people don't do it by default is how much more expensive and difficult

I worked on a construction app that was offline first, and let me tell you the reason why people don't do it by default is how much more expensive and difficult it is. There isn't good tooling out there that just makes it work. So you have to do everything custom and carefully. And broken sync happens and conflicts happen.