Open Source is #COMMUNITY_SUPPORTED by the original DEVS --that their livelihoods and reputations as coders depend on. eg: #SOUND_CORE_LOGIC in code. bugs and corruptions also maintain.
..again its COMMUNITY SUPPORTED and since #Open_Source all code can be modified.
The only time you would want to modify code is only when you can START w/ SOUND CORE LOGIC in CODE;)
..Already done for you.
its a no brainer, massive time saver and allows for further innovations.