Disk drives are also large global mutable states. So is RAM at the operating system level. The article conflates the concept of data storage with best programm

Disk drives are also large global mutable states. So is RAM at the operating system level. The article conflates the concept of data storage with best programming practices. Sure, you should not change the global state throughout your app because it becomes impossible to manage. The database is actually an answer to how to do it transactionally and centrally without messing up your data.