I'm currently investigating the feasibility of using Next.js for a major refactor of our service and the one thing that stands out to me is how fractured the Next ecosystem is. More than 6 months after the App router was introduced the most important libraries are still in beta and don't have conclusive documentation for integrating with App dir.

For my projects localisation is a necessity. I tried both i18n and next-intl and found them both lacking in functionality, buggy and missing documentation. This should just be part of the framework or at least have a tighter integration.

The same story with next-auth.js, which confusingly still exists while promoting https://authjs.dev/. For the most basic implementation it probably works, but the app router documentation is spliced into the normal documentation which creates a whole lot of ambiguity.

There's been a lot of discussion surrounding caching for Next.js 13 as well. I personally find it confusing and the behaviour described in the documentation regarding revalidateTag/revalidatePath and client-side caching does not match my real world experience. I would love some more documentation regarding user-specific caching as well, for instance with personalised user dashboards.

It feels a bit ridiculous to release Next.js 14 today as we're still getting used to Next.js 13. And though there might not be any big/breaking changes it creates a feeling where Vercel is racing forward without keeping other library maintainers or its users in mind.