At my current gig we support two Next apps (both on the pages router) and are currently in the very early stages of building a new Next app using the app router. While we are very excited about the technology, adoption has been slowed by a few things.

1. Server components have poor support for certain (non tailwind) css solutions. We had hoped to use vanilla-extract as its syntacticly similar to other css-in-js solutions, but ran into issues with HMR completely falling apart locally if the page contained a NextImage. We ended up falling back to good ol’ fashion sass modules.

2. As some other commenters mentioned googling for support somewhat consistently lands you on the opposite routers docs and while it’s somewhat obvious to tell where you are its still missable if you are moving quick.

All that to say I’m personally, _sorta_ burnt on Next and have found a ton of joy using svelte + sveltekit for my personal/hobby projects.