The Comment by @AndreSilva best reflects the way I have been handling old Shopping List Questions since asking this Question.
For old Shopping List Questions there was often considerable investment by answerers into providing some very comprehensive and valuable Answers, and that should not be lost, so I now flag them to request that the moderators convert them to Community Wiki. However, if I see an old Shopping List Question with no or only poor Answers, I may vote for it to be closed.
For new Shopping List Questions I am likely to vote for closure. The exception on a new Shopping List Question is when it is clearly written to go straight to Community Wiki. An excellent example of such an exception, is Comparison of open data portal solutionsComparison of open data portal solutions.
I will not attempt to define a Shopping List Question here because that has already been done by others via links in my Question, and there are certainly some grey areas that I think will be best left for each of us to exercise our own judgement on.