Similar experience, started in the page router days.
Nowadays no idea what they are trying to do with it, I rather be dropped into a random Spring or ASP.NET project, or even C, than Next.js.
Sadly it is the new darling of SaaS cloud products as extension SDK and deployment partner, and thus the only way to some consulting gigs.
I still hope they will get their act together in the latest releases, after all server components were a huge shift with a lot of rough edges to figure out.