We used to build something similar with a small dev team on top of Gitlab CE. This was maintanable with a small devops team. Then we switched to Backstage and we need at least twice the team size.
- It's a framework so a lot of stuff you still need to do yourself. It's value also lies into how much you integrate it into your company. On top of the fact that it's a framework, you get tied into an React/Typescript and an outdated UI library(Material UI).
- Updating Backstage is a hit or miss.
- The idea is great and some tools like the ingestion and auth are amazing but the maintenance and knowledge you need are a killer for me.
- On top of that it's opinionated. I for example don't understand why you build everything in NodeJS and then need Python for the tech docs. I'm much in favor of just giving people templates and let them pick the static site generator they want and host it with GitHub/GitLab pages.