More practically: for example, I write my web service(s) with event sourced architecture. Now any worker, or any service sending a command, can operate against the storage. Regardless of version.

Other architectural patterns offer the same kinds of options. Clean architecture or hexagonal architecture limits the surface (coupling) between your versioned logic and the data so much, that they can version independent.

Alas, most web development uses some ORM as the center of the app. Active record, for example. An architecture known for its immense and tight coupling to the database. An architecture that has as major downside that businesslogic cannot evolve separate from the data store.

Your parent commentor very likely is, unaware, running into this downside and projects that experience to all of web development.