It's been 4 years since I asked Applying version control to ArcGIS Models.
The essence of my question for the main site is: has anything significant in the landscape changed since then? combined with recasting the Q so it targets toolboxes themselves and all components rather than just a common component (models).
The question for meta is : what is your opinion on whether it would be better to edit the question and offer a bounty, or to post as a new question referencing the old?
On other Stack sites my experience with offering bounties to get new information on old questions is rather dismal, so I'm leery of that, but I also tend to prefer consolidation over proliferation... I'm conflicted, help me out. ;-)