Isn't the requirement to disclose source with a system so that you can make changes (bug fixes and such) without being locked into a vendor? Current source offe

Isn't the requirement to disclose source with a system so that you can make changes (bug fixes and such) without being locked into a vendor? Current source offers that. Other than that licenses typically stipulate that there are no warranties and no support. I see source history more as a support tool (to understand design decisions) than as the "absolute" ability to fix a bug. (This is not and answer to the question, I realize.)