Next has zero opinions for anything other than routing.
Blitz provides conventions, file structure, data handling, background processing, data validation, db schema and migrations, code generation and scaffolding, project REPL for easily running and testing all your code, built in (and swappable) authn & authz, etc.
Additionally, Blitz removes the Next limitation of having all pages in a single folder. With Blitz, you can place your routes throughout the files structure as needed.
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