I know that there are some pretty big components that are Sage-only, like the sage-combinat package, and I know the people working on it are packaging it correc

I know that there are some pretty big components that are Sage-only, like the sage-combinat package, and I know the people working on it are packaging it correctly (i.e. no grad-student kind of work). I don't know what proportion of the work goes into such components instead of integrating every other major free math software out there. I'm just surprised to see Sage getting accusations of grad-student level of maintainership code. Are they really scrambling that much outside of the mature math projects for code?