> So long as you don't lose data

The article advocates storing data in local sqlite on single server. That means that when the server goes poof you will lose data. How much data, depends on how frequently you run backups. But it will be non-zero amount.

And backups bring the other point. It will never be just one server like the author proclaims. You need another server for the backups. Now you have two servers, and a dependency between them. The dreaded complexity is creeping in again, almost if it was inevitable