>>mroche+(OP)
The title as written is obviously true. Obviously any project can be "open source" with or without builds. There is no requirement that "open source" even compiles! The real issue here is: "is it better for the project to provide builds?" and I think that the answer is almost certainly yes even if for nothing else other than the same reason as "should the project compile?" Now, as with all "good things" there are questions of whether its better to put effort into this good thing vs that good thing and that is a fair discussion, but having the project deliver builds is almost certainly "a good thing."