Point being (again), definitions seem to differ, and what you call "full stack" is what I call "batteries-included framework". Full stack simply means (for me) that it gives you a way of building frontend and backend code, but implies nothing about what functionality is included in either part.

When it came to testing the whole product, end-to-end, owning both sides gave us not only more options to consider, but also more tools to choose from.

We chose to define the frontend in one technology stack (Angular+TypeScript/JavaScript) and the backend in another (Ruby+Ruby on Rails), but both came together to fulfill a singular product vision.

Backend Vs Frontend: Guide to Development for Developers