Why R-project source code is not on Github

Your suggestion to move to Github is perhaps based upon a false premise, that the R community at large has the ability to directly post code/patches to the official distribution.

That's not the false premise here. This is:

 "one simply can't ignore Github ,where collaboration is at it's best"
- Gaurav Sehrawat

speaking as someone often labelled a git[hub]-fanboy, even I can find
reasons to debate this statement.

Barry