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This opinion is quite popular nowadays but IMHO it is caused by misunderstanding what a database and database management system is and what it is for.

DBMS (and in particular) RDBMS is not a merely persistence medium for an application - DBMS main role is to _share_ data between applications.

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I don’t understand this as distinction with file systems. Networked file systems exist and I have a lot of production code that shares data as files in either some networked file/blob system. Often databases even just store a reference to a file path for stuff like images/other large artifacts that are shared from some file system.

Read-only sharing is trivial. Concurrent write accesses, not so much.

Indeed - a filesystem is a form of DBMS and provides data sharing capabilities. These capabilities are very poor though - especially its data model (or rather lack of one) makes data sharing difficult as applications cannot rely on it and implement their own proprietary data model instead.

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