BTW, thanks for the suggestion.
I think this may be the same issue many of us have with Software Update: Apple's attempt to provide a streamlined/simplified user experience reduces the available options for those more technically adept.
(Of course, one can always simply disable/re-enable extensions of questionable merit as needed until a determination has been made as to whether they have enough value to be worth keeping, and then uninstall those which fail to make the cut; disabling and uninstalling can both be done from within Safari's Extensions pref.)