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You are not remembering wrong; this was changed in 12. I'm guessing that previously, folks could change the Copy menus without specifying a useful name and it would be hard to know if they really were true to the originals or not; and that tools such as Base Elements ended up reporting unreferenced menus so that folks felt compelled to remove them (an extra step).
Personally, I like having a full set of original menus to refer to - especially since the menu customization part of FM is modal - within my files. So I have some starting files where I've recreated the full set just for that purpose. Wish the Duplicate button were available for the Standard set. Have thought of requesting that, but haven't done so as of yet.