The ability to do what _why did is a disadvantage but it's offset by the advantage of being able to keep as many copies of the source as you like. It is idealistic to think that we can rely on project authors to always make sure the code and documents are hosted. If you are going to use OSS you have to take it upon yourself to do a certain amount of maintenance. Part of what you are paying for with enterprise software is usually support and stability. Since OSS is (mostly) free, you have to invest a certain amount of time to get the same level of support and stability.