It seems to me like the rows "Stable releases", "Upgrade instructions" and "Installation" should all be removed, for different reasons... Andre Klapper made similar points in his email to mediawiki-l from a week ago. None of these rows really indicate anything about the quality of the software, or how easy it is to install/upgrade. And I think the "Installation" row, with its current data, is just incorrect - right now for all three extensions it says "easy (standard MediaWiki extension install)", and I think for both SMW and Wikibase, that's not the case - installation and upgrade may be easy, but it's not standard, because it involves more than one extension. Does anyone object to just removing them?
Topic on Manual talk:Managing data in MediaWiki
I agree. Also the row "Implementable on WMF wikis" currently just has question marks so could also be removed.
I posted a similar topic above before I read this. I think the 'installation' row is useful, but not accurate at the moment.
Btw, I don't think that Wikibase has stable releases. Finding a version that works with the version of core has been challenging. If you are lucky, the REL_XX branches work together with equivalent core, but those are not releases in the normal sense (tested, release notes, etc.).
REL_XX branches are the stable releases, and should always work with the equivalent core releases.
Not having separate releases and just releasing with mediawiki was decided as a release strategy some years ago now.
If you find a set of REL branches that do not work then please file a phabricator ticket, but really this shouldn't ever happen.
With all that said I find the statement that finding versions of things that work together to be a bit odd.
I've removed the "Complementary tools & services" and "Implementable on WMF wikis" rows are they have been empty for over a year now (diff).