All good, but did you know that Next.js is a full stack framework? You can have backend and frontend in the same code base. You don't need Laravel if you use Next.
- no JS (well a tiny bit ships with Phoenix but I never have to look at it), no NPM, nothing that breaks every week
- the whole system lends itself to executing on multiple cores
- GenServers BEAM processes in general are amazing
But you do need to solve a lot of stuff that Laravel already solves for you.