Cool project! Will surely copy ideas from it :)

A general question for the room: where's the tipping point where you need a "proper" backend, in a different language, with all the inconveniences of possible type safety issues and impedance mismatches?

Because I feel like for 90% of small-medium projects it's just good enough with all the backend stuff within the same Next.js process as the front-end. I just do "separation of concerns"-ish with the code organization and funnel all communication with something structured and type safe like tRPC.

Feels separate enough but very pleasant to work anyway.

Am I doing it wrong?