I'm not sure I agree with this 100%. About two years ago I had to have shoulder surgery and so couldn't go golfing with my buddies -- I ended up making a mobile

I'm not sure I agree with this 100%. About two years ago I had to have shoulder surgery and so couldn't go golfing with my buddies -- I ended up making a mobile app to mimick the one used by the PGA Tour where I could track all of their scores online as they played so I could still participate in the banter with my golf buddies. A big issue was the fact that I wanted the live updates but had to deal with pretty spotty connection around the course. I ended up using Firebase and it handled that case just BEAUTIFULLY right out of the box; the data updates optimistically on the player's own device, and once a connection is established Firebase syncs it with the datastore and all other phones update accordingly. I would say that this is some pretty sophisticated behavior that I, the developer, just used right out the box following documentation.