I agree with your points. The saving in the case of released source code is that, if the original analysis is flawed in such a way that there's no need to repea

I agree with your points. The saving in the case of released source code is that, if the original analysis is flawed in such a way that there's no need to repeat it because it's wrong, then a large amount of expense and effort can be saved. Of course, if the original analysis holds up given the data and code, independent replication is a necessary thing.