Well, that was not so much discussed as just claimed by you, a claim which is plainly wrong since CC licenses do not contain specific terms about the distribution of source code.
This is a snippet of CC-BY-SA 4. (Version 3 is much wordier and states that updating the license to a later version is fair game)
If You Share the Licensed Material (including in modified form), You must:
retain the following if it is supplied by the Licensor with the Licensed Material:
identification of the creator(s) of the Licensed Material and any others designated to receive attribution, in any reasonable manner requested by the Licensor (including by pseudonym if designated);
a copyright notice;
a notice that refers to this Public License;
a notice that refers to the disclaimer of warranties;
a URI or hyperlink to the Licensed Material to the extent reasonably practicable;
indicate if You modified the Licensed Material and retain an indication of any previous modifications; and
indicate the Licensed Material is licensed under this Public License, and include the text of, or the URI or hyperlink to, this Public License.
In no way it states that you need to distribute anything but the end result. Even with derived work, just whatever is the end product becomes is fine. Because this is a license that's supposed to be easy to use: Just publish something and tell people if they can use it or not. There are no pesky requirements for the author.
There is another interesting part in the license:
The Licensor waives and/or agrees not to assert any right or authority to forbid You from making technical modifications necessary to exercise the Licensed Rights, including technical modifications necessary to circumvent Effective Technological Measures.
Yes, this means anyone can use a screenshot of pak192.comic to cut out pieces of the graphics and use them however they want, as long as they attribute and share alike. There is an easier way to gain access to that stuff by simply asking for it though.
Either way: If, as you claim, the license requires publishing of sources, presenting them on a sliver tablet, how could they ever require circumvention of technological measures, so that a paragraph about it would be necessary?
Bottom line, stop spreading misinformation please.