I'm currently looking to piece together a kubernetes native "forge" and there are major gaps in the ecosystem. Why do we need everything in one application like every single "forge" claims to be? What about when I want something that's not supported.

How about Forge compatible components? Or forgeables? Naming is hard but hopefully you get the point...

I'm an expert, I'll go to harbor freight and weld some stuff together. It will still break down in 5-10 years but maybe I will at the very least have some control over the way I pivot.